Malicious PDF — malware analysis report

Static analysis result for SHA-256 73cf787296f8b8bb…

MALICIOUS

PDF

86.2 KB Created: 2021-08-14 22:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cbaf1f7b4af4bdd02d8cc9c1bfec2179 SHA-1: d6ef2b50a8f02dd2925f407d1fe66d5a2b0dee87 SHA-256: 73cf787296f8b8bb134221f22c5942c9880ed668c0fa669e7a4700d2679538ce
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of numerous embedded URLs, many hosted on compromised or suspicious domains, reinforces the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607becd9cd3f4---dopowaginoboxod.pdf In PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b02bd89237---94674976595.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4d5db37b7---wulegokobet.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/sevuk.pdfIn PDF document text
    • http://hydrem.ru/images/file/18809018372.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/15824686616.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aac91c69d1---xipidovanakonesobux.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160907556f14e9---ramatenekaxasovosekep.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/bc94e76759505b53d230bb4b589243c5/42395886778.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/tonurebotiti.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27db549f12---69696026154.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b9db354c356---22783018128.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/tudapozabu.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/rijunidegitidutarup.pdfIn PDF document text
    • http://akademibt.com/resimler/files/rukezuvuluzarobarejafino.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/4liqr0fdqiqq7jgf4u2ke4c5k4/zivetejiz.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/c72d04211905f2a40ecd9ed0d93d4456/melom.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/kerotuwuxuvuzil.pdfIn PDF document text
    • https://eviinstall.com/userfiles/files/57165828806.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/56447051260.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/75233925628.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd14d8cfc6---52762965508.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/65815735390.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=periodick%C3%A1+tabulka+prvk%C5%AF+pdfPDF 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_off0000e857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE857 19480 bytes
SHA-256: fdaad4038967dbdc752a8adf0d74ba62bb921483b184c203dc90fa5b6079168c
font_01_sfnt_off000117bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BC 11120 bytes
SHA-256: 3f444817ef2fc02e09477082b670509bb0f809b94d3f5355b722e15580c39918
font_02_sfnt_off000130e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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