Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad788b59d31cf231…

MALICIOUS

PDF

79.7 KB Created: 2021-04-27 19:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1058f0a4a26febdd39379beb3666549 SHA-1: 1501f2e18d5f4ce6f1c21d0a2ae01683fdd86981 SHA-256: ad788b59d31cf231ae1b07e68e588cc647a8a8fc03e4709d1f7111fc7ad59133
154 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9503

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://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160709255f2cef---mitonenogirupofirumugu.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/e6ecf32b5e61d539c093fd78f816fd55/filaladafule.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/doaeapml7ctrlj4umepv4vjoi6/tomedamirur.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789813ba55b---33260257184.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/msodca9pqbvr2u20uqv89tu9ai/nikixotebimobamu.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99e995104---buwozuta.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160706b5881128---wugokexakafe.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/4397140dbbc7b6c7ea37558f5caaff75/wajip.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/bfb28c6370d0df8c92d8cde9310583d3/78040298048.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/378d251c6cfe0e4762b2ffdd9ba6e656/38930940877.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e16d4b5e23---jijisanisepep.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e086a8a39e4f05fc28364f889e72b042/wowobevoradurolarada.pdf
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/22a21fc620785a185fd5474be1f7b8b8/36866483566.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f655d4e72---powuvizudafemifibotudinan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=journey+ps4+trophies+guide
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f77.bin
35121e7a6be1829092b5228a86876a4e706afbfb25f71b8663b2730499f6209c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F77 5160 bytes

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