Malicious PDF — malware analysis report

Static analysis result for SHA-256 a21683fe7316291d…

MALICIOUS

PDF

92.6 KB Created: 2021-08-11 12:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2cfb1c2a36a0ae041d9725b492d3747f SHA-1: 4f7186204a6d74a976e3c94746a6fb828153d8fa SHA-256: a21683fe7316291d37021a96c45483bc83173376054e98b0b1263244e3a6d21f
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1071.001 Web Protocols

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a link to an algorithmically generated URL, indicative of a phishing or malware distribution attempt. The 'SE_CLICKFIX' heuristic suggests the document instructs the user to execute a command, likely to download and run a second-stage payload, which is a common tactic for malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/53a66bcd1b4c6fa04691e67083f7a29e/zipitopuranu.pdf In PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/kk1ur3me5q30ut139klo2fed0k/88958340371.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/64840b9d3f5ccd9c2ece2e290efdb886/pipilobonabu.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/wuxubi.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1628639130.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/xogovexaxizimeb.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/75272029775.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/spmcqq2ngqp9pqd9p2h93orbng/gitugiditasojarifijud.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/10400686845.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/63659354838.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160853df0b30b7---31598809038.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/rokexixogosuzaxedejomegov.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/94881334403.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cc3c73e3d5fcd3b17f900db7a17660cc/votamagikepuneruvevizo.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607def579b241---38251329515.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160897fa814fe3---23281201801.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9f963a347---polulorirunudisopuvata.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/dbe5f130de983b8ce1753006dec68cca/18913356989.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/0f2d04adf169ffe23bf326ca8e413e7b/wanidesuvegixekig.pdfIn PDF document text
    • https://mattress-leader.com/media/47359438167.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/44353110706.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/lakifudepoworalijajaza.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/gagalajubadub.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6bf852c52---padelewubu.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/61470458914.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/19k9qsjpel2ik0o50f2l5i3se3/gozalarepunuwuneserusapuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+install+forge+1.16.5+macPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEF 18704 bytes
SHA-256: e5995ab08f435fa978dde4040264951a8ac9dadb6ee933956cee66932c879d7a
font_01_sfnt_off00011b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B43 11176 bytes
SHA-256: 5232555ce291b817015b0f25cba47dac70c41c95f6ad74ec8c10d3799c9d71fd
font_02_sfnt_off0001358c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1358C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D9D 16064 bytes
SHA-256: a013ce2342554bbd70a9f85285a6053b67e9b25eaba0dd22223cc179b1b1ea16

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