Malicious PDF — malware analysis report

Static analysis result for SHA-256 478b931a2b8aaa05…

MALICIOUS

PDF

87.1 KB Created: 2021-07-19 19:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c4b7120219f31283d64d0be4a561c97d SHA-1: b31e9abbd1fac8eb4f0bcc346b6c9a1b7f8c56fb SHA-256: 478b931a2b8aaa0511892d70463c9b6c19c67d6bc6450aa563c7e61cba127ec6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. These links are designed to redirect users to other locations, indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/085155ec1b68da037cf5c0497fc6a326/lilafo.pdf
    • https://mujeresenmovimientoplus.com/userfiles/file/14635755910.pdf
    • http://aotwresort.org/ckfinder/userfiles/files/novulorerudo.pdf
    • http://aliglobshop.com/userfiles/file/34972456667.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/6a6d2636d64ff52cc5a2a5899017d063/wulew.pdf
    • http://cpbnatation.fr/fckeditor/userfiles/file/vulegadibeju.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160720f85b49e1---33288045791.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071a6e42d32c---zeganafenepinadira.pdf
    • https://communeouchamps.fr/userfiles/file/63760657866.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/7a6468762fe421e324ec370fca7577d2/luvoxosujok.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/e04c805ea26c24b8f30939570a9fbbad/51298497277.pdf
    • http://yogo110.com/userfiles/file/32134375163.pdf
    • https://brothers-music.com/ckfinder/userfiles/files/81894965336.pdf
    • http://mitra.su/uploads/ckeditor/files/27354274562.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/0e70253d175097ed5b23e4783dd9fbc0/26903062784.pdf
    • http://diclenakliyat.com/userfiles/file/44857951617.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160f55c4238301---37394234198.pdf
    • http://tragiaocolamsapa.com/userfiles/image/file/14165491448.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe02b941f0---86039002593.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/b97fc996a722f4933e62b3509cfa8a86/59171001216.pdf
    • http://softtox.com/new/userfiles/file/vegazesi.pdf
    • https://hospvetcentral.pt/site/upload/file/3619531203.pdf
    • http://ciskmv.com/css/file/zugudofi.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/f85baac47c25a938e8d32be30ed375ce/79336192913.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=lake+county+superintendent+of+schools
    • 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_off0000f152.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF152 16792 bytes
font_01_sfnt_off00010969.bin
a987de36b2f8cd4350c2b37780d0d5668d54b93ffefe2dc623982fc3aceb0a1a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10969 10980 bytes
font_02_sfnt_off000122dc.bin
6773f22ffd427889de58d376c0ea13285aa0870b5a52761fd2820d60d4683a32
pdf-font-stream PDF embedded font (sfnt) at offset 0x122DC 16884 bytes