Malicious PDF — malware analysis report

Static analysis result for SHA-256 5922b3d8dc6f64bd…

MALICIOUS

PDF

84.4 KB Created: 2021-07-04 06:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b0e7ebad2073bcb170901542302694f3 SHA-1: 60bd9935c83574e633c4c8164fa14212781685d9 SHA-256: 5922b3d8dc6f64bd26d4461807b2f616f0f24ad20411285a53e94a6907b07167
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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
  • 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://thehideawayresortpattaya.com/userfiles/files/ginexu.pdf
    • https://10glazsikeyrosa.ru/file/66702604452.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0f6b7322f---lulefutaxiromarilamu.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/d062cjmcbaj7tur3egkh8bmus3/radugusikepu.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608b69ceaff90---11889199778.pdf
    • http://csptech.net/admin/userfiles/file/68686305232.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/d3b4e23e8b5e1c9d6acfc025182eea49/vowebarisani.pdf
    • https://abofahed.com/userfiles/file/86392517375.pdf
    • http://absigorta.come/file/tebenubesera.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/5502ba287856290224927bd79da0e18f/74323472698.pdf
    • http://malopolskiszlakwinny.pl/upload/File/devezodawanexiloduxuvol.pdf
    • https://thefertilizerequipment.com/d/files/lemivojasamipelorufudalep.pdf
    • http://gphs84.com/clients/866382/File/fasubekura.pdf
    • http://handbook.hu/upload/page/file/kovitiwuzumamufoxafedevi.pdf
    • http://s-privod.ru/userfiles/file/tizeve.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2725675e0---sojukipokoxokamuxaza.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ab26c85a2fdcbb1fea9f3599bb80072d/29653198905.pdf
    • https://kmkmekanik.com/upload/ckfinder/files/67894735.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=definition+of+protagonist+in+a+story
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e515.bin
9a039f84b5b0e6d2d54e5a93a96b629d000a893ba86ba3a868e6f332eebf1001		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE515 10600 bytes
font_01_sfnt_off0000fd7b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7B 16792 bytes
font_02_sfnt_off0001158d.bin
577424a7e5c043e4a050eb54016c2f1d6e3dee40d34562d2e97b580ca13ee619		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1158D 18048 bytes

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