Malicious PDF — malware analysis report

Static analysis result for SHA-256 5afa069c5e35795e…

MALICIOUS

PDF

82.0 KB Created: 2021-09-12 05:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5b80ee6b98f0c7108f31c5875dbfaaa2 SHA-1: 854d5c4da1dd0a6e07e8567aaab646059aefb985 SHA-256: 5afa069c5e35795e48841e3abe9bcace139e4f76473e4c18ced33a96843d01b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to redirect users to phishing or malware download sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://lightofislamonair.org/uploads/files/17417380072.pdf In PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161398cf692655---35003230999.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/gumupakale.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/99071262117.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/65074925500.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/12872109608.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/nazowunulewowemopi.pdfIn PDF document text
    • https://aokman-drive.com/d/files/fenin.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/gotejuzegomoxofaxuvugas.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/ruvuwudagepak.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/54833384925.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/ve5cl07tohvng4vskso83tk786/93699024340.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/86517071593.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/vprf4jitpdmpuhcvbdqtcp9maf/18622439229.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/82044651312.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/3144325210.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/sosopirajopujomuri.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/68883630859.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-5/20210905045508540941.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/duketutodonegipawikofus.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/42990689963.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/52127971022.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/mobixogolenidututubizaz.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/7qm3moo3ivmmdcvddvdk1sc17c/dimofoxerijodofum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=fear+the+walking+dead+season+6+episode+2+onlinePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A1 19040 bytes
SHA-256: 6b1f300dbdd1e95b8a6bc2d2a160753c44c21475886c8771e2e63893664d518d
font_01_sfnt_off00010841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10841 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12058 11116 bytes
SHA-256: 3e3c6255c47b96946fc2cc77872a4172f485116bddafece376ea28ba1f1a5895

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