Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecd0804c0c97bcf7…

MALICIOUS

PDF

81.2 KB Created: 2021-09-03 15:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 70b2196854405ede8b7c0a3b2179f813 SHA-1: e33587de15884b73f5b1dc722bd4f1068176f5ea SHA-256: ecd0804c0c97bcf752fb3fa8a1882945f0850d6ce8b96eb4be764ec0f4af61d9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a high number of embedded links pointing to various external websites, many of which are hosted on compromised or disposable domains. The heuristic firings indicate a link farm strategy, likely intended to distribute malicious content or conduct phishing attacks. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 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.
  • 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.
  • 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://huntic.ru/uplcv?utm_term=free+printable+kindergarten+homework+worksheets PDF link annotation
    • https://burgas-remonti.com/userfiles/file/47798885638.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/78370433620.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/97584297712.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/rewalofu.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/riserovugetofepaxaliko.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/vutupulizofur.pdfIn PDF document text
    • https://schmitz.cz/res/file/413311371.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/wojapugubojewuwabi.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/luxuromegerinidusowewo.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/xoxudepa.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/qdjb282cdf2i380691k6s7u79m/rikokimaz.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/68433493164.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/nevisipuxugiromisi.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/s5fctkn5bd04kegelobq962d9o/pafedivaraged.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/c52193be0bff593d30e569e9c28b181b/xafivazijabinupu.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/minanuxut.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/44a1eb4fba5d2e4cf027af0cc0398870/75125418961.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/73029829172.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec417feeb92---duwalatizede.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900ed2d8012---74055506052.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/ee4408b8a2dde2c3f549e13a6deb4eda/xivubaluluwideten.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_off0000d65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65C 18448 bytes
SHA-256: 1be6d56d0e434e773c326d72b2e416b8e20e20e16ee01b372e70b1e426e319b3
font_01_sfnt_off00010583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10583 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9A 11136 bytes
SHA-256: 2f671732f08ce021e68e033034e4e52a517ab637f3078b0ee1a668b3a1e7f9d0

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