Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef28b3813ad87c0…

MALICIOUS

PDF

61.3 KB Created: 2021-05-21 20:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a382d7a1ff1a1de6e2bcaede45a77c8c SHA-1: 4a0748f74c221ea44122815aae838025a8483ca4 SHA-256: 5ef28b3813ad87c02530ec494c91e2acedc577ac3829307b3574210d800d9d24
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8123

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://angkorphotographyguide.com/userfiles/file/vuzekuduneji.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b12d0de84---56398538080.pdf
    • http://barcelonasixtytwo.com/userfiles/file/ponozateref.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a471887ff20---8387191781.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863381778ed---mikapajuporig.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096345813088---sewapawejodof.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/idh5qit42ml71hi7b63btler21/tivaja.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b9c4e8c0a---15887719295.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/b9401cd4fcc9c156b6989acf130461a0/kevovodajatedabifunarikes.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16094066c70dee---91868710131.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607f606fd454c---41224125240.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e0c69e3de---wamiwabi.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/966a6147621af8dd017521fa7d167ef3/10670036566.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/86b1mekq1gkbm0juqqkhnaaodp/92967152990.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=scrum+master+certification+study+guide+pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891c4a73183---zutoxididobukijozuk.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcab.bin
20aed7b5ba90cc9577171fc6ab8b75ce8b901e7d25c95f49e5fc976b8b9b193d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAB 5528 bytes

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