Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f6bda28c4ec8e5…

MALICIOUS

PDF

77.1 KB Created: 2021-06-25 08:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f5b2709575d298e98086affacd50a44 SHA-1: 891031f910e7d1f58fa41844d25f5e00591d97f4 SHA-256: 91f6bda28c4ec8e5282820037d7d24a30ae55f59bff805e0179b056779c6ba9a
204 Risk Score

Malware Insights

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

This PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malicious content delivery mechanism. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phish for information. The presence of 'LOLBin token sequence' and embedded URLs further supports a malicious intent, likely to redirect the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b3feeae0a60---safavabaduwapajofif.pdf
    • http://beiks.info/public/file/dolov.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/e1645f352ab5c6b89e6ac931c3c86536/fevivinevego.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/tefp176f9tuu0stl0pfesls836/povuxegugexofixisijo.pdf
    • http://gorisum.net/fckeditor/upload_file/file/27629833691.pdf
    • http://sea-cruise.ru/ckfinder/userfiles/files/xowix.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/64815555375.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/3e8051323cbd243d9f7518a836c56101/neteroxakakolu.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/bafmqpg88fde7rk6m8fgg9hksh/25250733325.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/8cb3c154463e8f0e997a69c97b605274/66646681980.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748cc30de70---wukigumuzudejuveripifo.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/14l9lmk363bub77hv1sp8ngdv1/91438932430.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/44gjavfk5krdr8spdfpcmdbd5r/didefupulunitufirote.pdf
    • https://kasihpaham.com/contents//files/zuzejimosakuvavozadigen.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=class+6+chapter+2+history+question+answer
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eed8.bin
78161f6f752d6a5786ec7639de4fdbf9d33197d99251fc3a6f82c57007f19ac5
pdf-font-stream PDF embedded font (sfnt) at offset 0xEED8 5532 bytes
font_01_sfnt_off000101bb.bin
017f54bb1dd8da4ce3ba61703345f961eb92c3c8e662ca8bf3ddf2f68e5f2da9
pdf-font-stream PDF embedded font (sfnt) at offset 0x101BB 11112 bytes