Malicious PDF — malware analysis report

Static analysis result for SHA-256 639428479d2b8b2e…

MALICIOUS

PDF

69.3 KB Created: 2021-09-03 04:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aae34e8a79e309a1a899ca66ce95166d SHA-1: 1da7006819565ea12331000ccfee89a83512dc8f SHA-256: 639428479d2b8b2e04fef123b0dc29168b50ecb0c1220453a015bf2aa72a50d9
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable domains, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6678

Heuristics 5

  • 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
  • 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://coretry.ru/uplcv?utm_term=methods+of+artificial+insemination+in+animals+pdf PDF link annotation
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16090f9e6d76d7---29836666052.pdfIn PDF document text
    • http://salwex.hu/file/95159929657.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/81543746407.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/fd47a4c1e3655b31a7b89c320ace08e4/kumetisibawuberipowoxok.pdfIn PDF document text
    • http://furniture83.com/upload/files/75368733583.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/74114766364.pdfIn PDF document text
    • http://gibisch.org/files/files/37046086327.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8a48ddb05f1b6206d51f80040786d4b0/68891007761.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/82550233170.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/61266713930.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/75110038870.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/70307254114.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/fetunulodolubuxosapelu.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2f679f9bb---1928761470.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/94779272991.pdfIn PDF document text
    • http://yorkiematch.com/clients/6/65/653dc45b8f6063886304ac4260dbb99c/File/92027200593.pdfIn PDF document text
    • https://polandpools.com/contents//files/kamubir.pdfIn PDF document text
    • http://zlato-invest.cz/upload/files/15606764045.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/4248684135.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/86813584039.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160827846c7c57---xumenaridogawoxixowitovom.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a32e1d07052---53274654791.pdfIn PDF document text

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