Malicious PDF — malware analysis report

Static analysis result for SHA-256 58b4b52cf321613b…

MALICIOUS

PDF

60.8 KB Created: 2021-09-06 00:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 73f73ca46ca0bca2853cecf16e40f4af SHA-1: 0e8a21520d2c2e79bde6a7695b197f988eb34e2f SHA-256: 58b4b52cf321613b20b8d83047092a8089932f7752432489fc4a8fd94ca09b10
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for human readability but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6228

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 http://phoiinnhiet.com/images/uploads/files/71867674911.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/8096f28995c18a8a4009a5ed12b24f46/85260521667.pdf
    • http://mega-treid.com/userfiles/files/balinurogulobasopapofafa.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/d7953ec58294980f25de4f6255594b4c/60930069402.pdf
    • http://10glazsikeyrosa.ru/file/9304887548.pdf
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/vmo1hq61ouhtj5j1vdm3eo89o2/80117941875.pdf
    • http://azs-szermierka.pl/zdjecia/fck/file/62396595550.pdf
    • https://tresonance.org/uploadfiles/86102937798.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/v2n1pfoo75n89s46ioitkbl0l6/18201782199.pdf
    • http://the100voicesofgospel.de/fichiers/newsletter/file/57134805744.pdf
    • http://metallpress.ru/files/96551076947.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecd05c58bd---refapox.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afae23356f4---vakogimap.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c12368bd832---xuriwofumokotitase.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611733565bf3c---11212050919.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce44c4f4a3---kekanenozitikina.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884b105f295---31022870892.pdf
    • https://dollarplus98.com/images/upload/files/ganuxi.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c4e16542f9---wimopifinipuvuxaxosabudax.pdf
    • http://tamker.hu/userfiles/file/61463426479.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/9f889ce09da6991e6b6931ad6059fbff/58274734815.pdf
    • http://jarosi.hu/files/file/gasegawixojuxaga.pdf
    • http://daotaonhaccong.com/uploads/userfiles/file/degibozudejotumoso.pdf
    • http://asiavent.com/UserFiles/file///2617745460.pdf
    • https://bawwabatrizq.com/userfiles/file/17515419232.pdf
    • https://maturana.cl/upload/file/60079959968.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=past+simple+vs+past+continuous+vs+present+perfect+exercises+pdf

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