Malicious PDF — malware analysis report

Static analysis result for SHA-256 c11a14a04fa857e2…

MALICIOUS

PDF

60.3 KB Created: 2021-06-23 18:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 7c4f331ac507a3f245b3d998969fdd34 SHA-1: 4dfefd4a24debbc68f1701dccd3b3428e5f46b03 SHA-256: c11a14a04fa857e2933a5bef50348b19ea58f9a2e49eca521184da92e84f6105
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external resources, consistent with phishing or malware distribution tactics. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=foxit+phantom+manual PDF link annotation
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3818d743e---birosirolusafamufezufefe.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/fererivezomu.pdfIn PDF document text
    • https://x-software.cz/data/file/wagekegabapular.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/47cf5727d47ecdce8dde6444bae006f5/zumula.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/31974791904.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/2a60497e5794c4f1dd2eb6cbd17129c9/89877773223.pdfIn PDF document text
    • http://pritchardreunion.com/clients/81409/File/33256825132.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/764b768ece17cb8d81145a08825f876f/kubofitavaxuvadakiz.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c010f8a46af---69604407909.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/9d236cc3438228020a7c025afc96914a/soputujuxevifazaze.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a648c94d06b---88748112706.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf7b5b92a6---66869673526.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/pewikaxifobiw.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160926eb17336f---90961984549.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/3650b3c6199ba6d8f82b9376093b618b/25636283928.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4ed94793e---lapidebulununite.pdfIn PDF document text
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/5988111941.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/pgvlf73avutqdon088sbcqfchk/nukunugemurozabijizogi.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_off0000b244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB244 4808 bytes
SHA-256: ae093915d517a88beeb68e196c4e09cce15dc6e416d8ebaf5025d9db069dc45f
font_01_sfnt_off0000c27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC27E 9968 bytes
SHA-256: 969a24a53700fb9199e945b814125787be10ed4b41ae9efada34e72de220a1cf