Malicious PDF — malware analysis report

Static analysis result for SHA-256 06bb72d56180582b…

MALICIOUS

PDF

89.0 KB Created: 2021-08-19 11:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4d7ffec528e21b4c1d14f4adfb1f7241 SHA-1: 8afca1e3e259d0966fd1edf5c6d8617055700e0f SHA-256: 06bb72d56180582bf076aad05b96391948307e9077e487e1f44891a5862813dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high score further support its malicious nature. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific intent beyond the presence of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=list+14+characteristics+of+effective+listeners PDF link annotation
    • http://murasakijr.com/uploads/files/52837576438.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/15683327884.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/dqrthhpssfkm6v0k55e5b5m661/tuzilijijuk.pdfIn PDF document text
    • http://holzweiss.at/95298730385.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/fanudovaj.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/sofokelini.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d95e4e972a---poxemisogaxorilo.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a24ba860a7---7464198110.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/ferimunujelo.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/10js7saknc2f8bhbe7tie4r852/kilaxakogidavesimanul.pdfIn PDF document text
    • http://poorclarescork.ie/images/nuvirut.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/63857894659.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/veliripu.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/22134351015.pdfIn PDF document text
    • http://change4best.ru/upload/file/dixibon.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8507282cf---86961839627.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/xonumasudoti.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/18028720997.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/63496101a57e122ed8a51cde7784d18b/50978443542.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/5fd1ec969a38d620c4d5a95927ffd2b1/16013838562.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1627900924.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/wunotulivaxufetasiluleg.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b07823ae9---wunowodi.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/66406869449.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/vomesotawumosujob.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa88d106cfd---88740246095.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161191f046d9f5---48887617901.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_off0000f7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF0 10588 bytes
SHA-256: 6306aa6068267ed920ab0cffc7b347139c709bb886a585e2a3b84b756304447e
font_02_sfnt_off00012826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12826 17300 bytes
SHA-256: 8b1cbfe3e8e50b0baa6e2ea021e6f5605bfd3f3dbdbee9edb102252d524f9bd0

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