Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35c97bdf4b7711a…

MALICIOUS

PDF

61.3 KB Created: 2021-06-29 08:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7c2bd422b0322036f9420843fb9a7ffa SHA-1: 13205f71230a99b2cd9eb345012820e86bde1b15 SHA-256: f35c97bdf4b7711afab132f4c0fd946ae496b83e44580a478b9cc890fe8b3a87
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URIs and the nature of the link farm indicate a likely spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5046

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://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/nuxowifobubaf.pdf
    • http://zkojicin.cz/userfiles/file/lalupotebufamuxi.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/130a4211f75f8f254b49a1d618bb48dd/34325893879.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/ff6b9bb957edf30e4ee17a4f2f316863/42796909737.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/aedd7e44d4d0e8e62e17d7f5bea59945/totuganiputirew.pdf
    • http://aostavet.it/userfiles/files/96985650616.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e6f3650f02b9fd824cf436cf0f511c1f/34188614455.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160da990c0ac65---zebegin.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eda66815c2---6118889093.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b245580ea---49748376401.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/ba7cb1861a2160a1f64a1ccf0fbc4b97/31361128802.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/611255a48e78fb51bc6b5259a41bb5fb/sawebizuweraw.pdf
    • http://shqinze.net/admin/upimg/file///59131127721.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093b2e50479b---tenuka.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/ps441bkpeb2ajbfpvenlig97d2/67504796274.pdf
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/17521955548.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a4496c75d---kisanuzenilarejanu.pdf
    • http://comp-art.ru/userfiles/file/xibojumesubitatibudijud.pdf
    • http://mg001.cn/upload_fck/file/2021-5-13/20210513005711926686.pdf
    • http://www.ecvbrass.ch/user/web/file/29170950621.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a89ae3f3b52---ritefobozezowijatixa.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/ceb21a545ef9632263ad7db08bf88345/dotorekuxus.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609631ee6f7bf---10539478755.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/0d8e76a0b50fd4095f3ae32a778b0af3/rarudi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=dungeons+and+dragons+lost+mine+of+phandelver+pdf

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