Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b80bad420097301…

MALICIOUS

PDF

61.1 KB Created: 2021-06-22 15:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ae954384a4b3fe8c0930f3e74fddfac8 SHA-1: 4a6674e86997edbfc717409b4ade9ef086fbcbb8 SHA-256: 2b80bad4200973018764e2cbd08945aff754c7b8cc65586000edd81acf851f98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on compromised WordPress sites. The primary purpose appears to be redirecting users to malicious content, likely to download further payloads or harvest credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://laborke.ru/uplcv?utm_term=ppsspp+games+download+files PDF link annotation
    • http://tatugigo.com/ckfinder/userfiles/files/35120552410.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/f132969887d048796d699c4c62f077b3/4726091819.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/nizoj.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/14164548758.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1fc87789a---dufud.pdfIn PDF document text
    • http://lovellreunion.com/clients/4/42/420738e4954c29d3cfd02fdb1bc9139f/File/58948333901.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9c0db6506---lofixix.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d312b850---58374370322.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/ao3l6pigfk6q76ueslebdbpa7c/71808474131.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/82362126096.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/31958668263.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5dc08346f1---86212817281.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/3291161274.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/4pft2uepr382o7crv8tjjrmns3/73851132415.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/sakema.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB35B 5356 bytes
SHA-256: ca1eb60ebdf973ac12910dd78e1ee1e599c67ba03a2e6efef5d73488809a9475
font_01_sfnt_off0000c598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC598 9948 bytes
SHA-256: b65028f9fa08f119e867ff0b9a84424b9ec534d32edfbd007e3e2df39062d036

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