Malicious PDF — malware analysis report

Static analysis result for SHA-256 12dc34abcdb8c890…

MALICIOUS

PDF

64.0 KB Created: 2021-05-10 06:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f756da983493b5a9c157571b1d5d8be4 SHA-1: 56b8f9b4eff8472377284db328dff1848ccb0e97 SHA-256: 12dc34abcdb8c890552af520710d458ef55b3a45afb5ee054ab0881f9fea4bc1
154 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It functions as a link farm, directing users to various compromised WordPress sites hosting further malicious PDFs. The embedded URLs suggest a phishing lure related to technical support or device management issues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8461

Heuristics 5

  • 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
  • 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://queure.ru/uplcv?utm_term=android+device+manager+mac+not+working
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/1e6ae4170b6f6abe82ad88cf3659079d/46615562412.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af44cb3cd3---jifijok.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/fe0e9cb798bb3827b409171237664825/57205597248.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bcf97a927---xoxopuzuvetej.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba1aa24a8a---gapesejasuwovo.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160725531d9a0c---xinutijuzevobuxikalel.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/d0416ba92322184c2a83e6a29819a290/41216912433.pdf
    • https://nikosdimos.gr/userfiles/file/regenupokezexawitusejo.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e51d05f409---pobixivesaguledulobeted.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d33cd8814e---7754969715.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7faedf23f---63638361908.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/94162556317.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/11051d63f91f14508cdd2107022ad333/pikazekatisapuja.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d236d0147b---19793893025.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607504402f482---vexolamebijisavug.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df0a.bin
d45f80dd8d355a43db6731aa940c5fa6ad66285aa7c27cac20ffecdf8f700f13		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0A 5252 bytes

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