Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc2a2c2c91cf1731…

MALICIOUS

PDF

81.4 KB Created: 2021-09-05 04:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c6a369a8fed1a644f3b617894922eb4b SHA-1: 1e6b3f65e69158d27905e4a1fb0b9e7d132ae50a SHA-256: bc2a2c2c91cf17319650502caaf4e109e158761caf67ab63b85fb50a0b65b7c1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware-hosting sites. The presence of compromised CMS upload links suggests a tactic to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://eska-lift.ru/userfiles/file/gixuxelusevejadu.pdf In PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607974f07aaed---tavegizezexetoridimi.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/42368470910.pdfIn PDF document text
    • http://prestizhstroycompany.ru/SITE/files/editor/file/69667468299.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160996f3e8eaff---26422098478.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/tikabusezo.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160da1fba5b3b3---90748329443.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf06460659---14320749216.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ba89cd4ba---7735605094.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/dajopisuxo.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/fazilenivolutoju.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/bfca59801506186b8d29e8fda896411b/zuravoxopirejafe.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/gakexeji.pdfIn PDF document text
    • http://bociany.sk/media/file/kadonuf.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0eb2828ae8---nilewibekutaviged.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/gimugaxubusavituwado.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/53166035356.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/xepajoluwuzudusoko.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/47155583446.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/12011166271.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/87519390606.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=clasificacion+de+black+cavidades+dentales+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_off0000d67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67C 19100 bytes
SHA-256: 11738a9a3e48762901b94daba67b65d164dc04be0a0f6fa4db2ad459fbc513d3
font_01_sfnt_off00010675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10675 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8C 10844 bytes
SHA-256: 5a04b3a67f16a923da0aa0a36d56c6965e85656034499b0c7af761b012242e95

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