Malicious PDF — malware analysis report

Static analysis result for SHA-256 abac526d6a6174ea…

MALICIOUS

PDF

58.4 KB Created: 2021-09-26 14:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a628e9aaaa5c488f442e44c7d9204a88 SHA-1: 8a4e6d82f7bd888549d31f33ecdc1da74917de49 SHA-256: abac526d6a6174ea64aa4147851820b0f44405afb0fdd7ecd99656df732dab02
174 Risk Score

Malware Insights

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

The PDF file is identified as a phishing lure due to its image-only content and embedded clickable links. Several heuristics indicate it's designed to lead users to compromised CMS upload storage or disposable hosting, likely for malware distribution or credential harvesting. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5575

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 58 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://catherine-massage.com/ckfinder/userfiles/files/35288145388.pdf In PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133897e52dce---mesegidigo.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/9021030143.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161451bf179d36---7853827329.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/67167215900.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/bosagi.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138416819b45---40061043684.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/1713893738.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/retilovogegubu.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/xodekituxoguwozaravevomo.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210903_7F11B814CDFF7972.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614b211ee032e---66974883749.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/sipavoxejupi.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/towalomanogibiwavesijun.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/120448293601.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/jelezezimiduwazuvuwupe.pdfIn PDF document text
    • http://xtra360.net/campannas/file/zuwarukejiruj.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/22658498614.pdfIn PDF document text
    • https://chimrodistribution.ro/poze_diverse/file/18547321886.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/ef909758865bfbac694d4ef7f6b00cd3/luratosibinigevexax.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/sefuwatasabigapo.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/15514885403.pdfIn PDF document text
    • https://1ar.sa/userfiles/file/48976717847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=before+we+go+movie+onlinePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB15B 10336 bytes
SHA-256: 7e0cc98e2e73c22a3b33cd43f07a74af5cf3094084a878d9b4ca8876986a918a
font_01_sfnt_off0000c8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1