Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c97a63f7e13e827…

MALICIOUS

PDF

63.2 KB Created: 2021-05-24 03:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed9a08038cee05b95ac8f4ad1bb92e4d SHA-1: 1ac977a27433f31332b151408a6de0a6f14cd516 SHA-256: 5c97a63f7e13e827d1f253a0b6d8ae25ab1fba9f757c673b724510a4079a7a9d
154 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. The document functions as a link farm, containing numerous embedded URLs that point to compromised CMS uploads and disposable hosting, likely intended to lure users into clicking malicious links. The presence of these links strongly suggests an attempt at phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8608

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://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/dm59j61hg620tcochldkvt4ujt/36592489821.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/466408a0053effb26c7c08287d6b21af/9170323509.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609436f4032f5---xobivufatujadadokixej.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc13683282---lawigifepowosatewene.pdf
    • https://noddy.nu/images/file/33907202190.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/oem78osnkmf864fg0444ms4apl/43987888390.pdf
    • http://duszek-lasu.pl/userfiles/file/zegukanuvinivosakataj.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608307ceb7ed0---61912116357.pdf
    • https://promise-land.com/upload/file/pebox.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/73934047660a0b2b64ec4a.pdf
    • https://people11people.gr/uploads/File/19615445291.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/17a290eefa931de9d60cca59cb6ebb94/77132214512.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aabc46682e7---kobifokofetesofuposazo.pdf
    • http://on-video.com/movies/movie_data/file/29842432342.pdf
    • http://skiflogistics.ru/userfiles/file/kituzogavoposefopur.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=centurion+d5+smart+gate+motor+manual
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce43.bin
a19292b2c942c683daf20e27b600cca637f97e006ecb7b0d132e0594e699b649		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE43 5172 bytes

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