Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe9d4cdb4316cdce…

MALICIOUS

PDF

70.5 KB Created: 2021-06-20 08:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b58886d8e39b496e39ebd43d829fa1ee SHA-1: 87811c58bbd619bab600d700a4ae434fe23fe648 SHA-256: fe9d4cdb4316cdcebf8f34750f2f0fc96ab2fd221b36031370216c4956d2df67
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of external links and the nature of the heuristics suggest a phishing or malware distribution vector, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/5429bd9aa1251d7b8b3d203cc66b4856/suzezegupa.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/9mi5espuif7220jch9gatst331/kesosopatuxafa.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/c5db3fd9bb66af78d4847fd487fd037d/mefusulozef.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/95ea26277f74e03dfc25965c1255fc43/24105605910.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/897488d2e17ff082bbbc351234f0e12c/xirofoxaj.pdf
    • http://atdawnwelift.com/userfiles/file/gixuraganamipo.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/coktrmj1tjnsntnjpuiftq7m10/petareloririranugemeloxe.pdf
    • https://dienlanhhonganh.com/images/pic/file/34239999627.pdf
    • https://holocaustresearch.pl/nowy/photo/file/sevalezunur.pdf
    • http://veraschwemmle.de/fckdata/file/76850786213.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/44122132819.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/2240f7aa2df354870d4ba75f98650c9f/89352848846.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a166bdc2715---fewisub.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/53861c7291730866e53f502fe19edcc9/89259499419.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/7d61970b196ce10dde5ca8103d93b523/61209399827.pdf
    • http://pivotal-technologies.com/userfiles/file/mimam.pdf
    • https://ahreco.com/uploads/news_file/11765995125.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/nn5g1521kqun31mfa9otbp4qss/59275409326.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=power+plant+engineering+pk+nag+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccd2.bin
610056a7a629be46a625d7dd6966b9f825122775d9e70d090f68735c021a2328
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD2 5188 bytes
font_01_sfnt_off0000de98.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE98 1800 bytes
font_02_sfnt_off0000e725.bin
8f52bc0336e9a31a6a67eeb268ea94dca869dc1dda3daf8501111ca848febf5d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE725 10932 bytes