Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a856b330edb231…

MALICIOUS

PDF

79.0 KB Created: 2021-09-03 21:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a6de84546015ef1730c8e6b1595bdd00 SHA-1: f2ea8792b13d4c469ddc46dfaf2921116e0b84a5 SHA-256: f7a856b330edb2316b04a63da47907ddaf1292c879f2db17a1731d851b49b53b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to potentially compromised websites. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to redirect the user to phishing or malware-hosting sites. The numerous external URIs, many hosted on what appear to be compromised CMS platforms, reinforce the phishing and distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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 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://crewmak.ru/uplcv?utm_term=sensoriamento+remoto+exercicios+pdf PDF link annotation
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bb5f3be65---83942600676.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/lizubulizezewi.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/60738070873.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/tubekoken.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4c427fccd---43207065724.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/pezamarizamotojusatu.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/zanolotimalaketamupig.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a3fcc3aa7---95279174991.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/40ae31ec1a54fb1145cabb53768284c6/zarenamufusav.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/98693027061.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/pudexozuwupogosuses.pdfIn PDF document text
    • http://www.pilartangguh.com/file/98084683853.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/jinajiwovilowanelelak.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/25079532817.pdfIn PDF document text
    • http://mobiliteit.nu/files/60006606383.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/67921714790.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/c2344ff77a90f5dfd6b46019f059870b/54597465045.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/72973204395.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/15178909810.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094828934e13---dejomomabi.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/ad74875ddf3270d024b2a603fa4bfba2/gesevokani.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/fugemuj.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/32255187538.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/98284992141.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/b10ea275feef9af3a7373af4d093bbbf/76408660200.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63E 10912 bytes
SHA-256: b99b351231df242293c817dd68591a78ec931b4dcb54beb524dd776fa179ca2f
font_02_sfnt_off0000ff7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7F 18296 bytes
SHA-256: e69d7580ff1c48f4f45afd996c60a190ac63c703ebc113ec34e786ac3860f5dc

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