Malicious PDF — malware analysis report

Static analysis result for SHA-256 f08c3ee01fa23cd6…

MALICIOUS

PDF

73.7 KB Created: 2021-09-07 05:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4bf9b3ffa14d61cf0802850b946bf01c SHA-1: e1d32c0e0c5520c23a9fc7fdff0f83ac5e578a73 SHA-256: f08c3ee01fa23cd60972429b9ef1d01af028718010f751a42013cab9454e59ef
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or phish users. While no scripts were directly extracted, the PDF structure and embedded URLs strongly suggest it's part of a malicious campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5832

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 http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/dde6f2a84b25ed563f6dafa05945b402/94629840491.pdf In PDF document text
    • https://aslimitada.com/userfiles/file/13621892576.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/jatofomamagekizuw.pdfIn PDF document text
    • http://huiking.cn/uploads/file/311542223071.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/xuvuwukafotebixini.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/80805909959.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/b4akjcp9iv8hh54tk3ld6cfe4t/67037616415.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/ljpffq47c5e47j0aj7b5ovll2q/betomugi.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/q8117032inrgs60afev1hs315j/rapewa.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/26192241385.pdfIn PDF document text
    • http://marymo.ru/uploads/files/fudakizisakadowipi.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/14901488784.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e946535ed2a---vozibagijexat.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/d8cc3lr5r7epl4o8qcccbqkrjj/70721762247.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/fdfa0fbbd1753111b7f35982553eefad/latafobujalaf.pdfIn PDF document text
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/64910746585.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/8f338d63c415846f123785857077cdd9/443142747.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e81701e935dbf634d7594cc050bad722/31101055746.pdfIn PDF document text
    • https://stopserv.ru/files/file/8561511380.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8fc593f91---wabijuxiwo.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/d1a5ada0755d166cad3daa76472d06d4/mimotitojowevijojamiwalu.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/wuginuzax.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/34056879081.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=menstrual+hygiene+questionnaire+pdfPDF 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_off0000cf4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75E 19908 bytes
SHA-256: 76d9bc171d71093d592de9dc7efc9e8a09b8f991c47d161f38f53024b619a98f