Malicious PDF — malware analysis report

Static analysis result for SHA-256 b88c051fe2b2efef…

MALICIOUS

PDF

102.6 KB Created: 2021-07-25 13:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c06a421e8a772c187af271f059e22427 SHA-1: f9938bfdb865c29bc14e7db02844943548de40bc SHA-256: b88c051fe2b2efef85dd6e4f381be21d2b9fb234260754e67424bdcb43d15048
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. Heuristics indicate the document functions as a link farm, pointing to multiple compromised WordPress upload directories and disposable hosting sites. These links likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • 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.
  • 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://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/968114033d733e18fc8051b95d9b8c84/jemefofugejubolagas.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713062139c7---xedinuluxerez.pdf
    • http://bud-drog.pl/userfiles/file/liguxizanimonafemabut.pdf
    • http://urbancollab.com/userfiles/Proj_Name//files/2893354267.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/9c15fc3200d976bd962c395edf5c4c22/tidumudaguzuronegumatereg.pdf
    • https://herfection.tw/upload/ckfinder_temp/files/20210623142719.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cac68fa9ea4---suleje.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607eba38226f5---67758630293.pdf
    • https://sproname.com/files/userfiles/files/zasesagebuzulidiwapav.pdf
    • http://snypes.nl/img/customer//files/30034036862.pdf
    • https://codecs.ro/images/file/15180056615.pdf
    • http://brkvinc.com/userfiles/file/50596800367.pdf
    • http://bbfederico2.net/userfiles/file/jumurosises.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/o74v8kq463plnjq88lj9ee4ka1/89989406130.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef9d37272b---47915748334.pdf
    • http://www.ufolep-69.com/contenus/files/putilojisakiw.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14db264ad8---45922382774.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/61563af97433b4c08f458c26892fcb7e/xuwazij.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160e854f0d2997---79472303192.pdf
    • http://tomaszfilipczak.pl/userfiles/file/4515095570.pdf
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6032438197.pdf
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/40372641596.pdf
    • https://rajatotogroup2.com/contents//files/fawelifumisiwuzabasoj.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bf51ac10f82---71624523483.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/06d9e1666f354014fd6ad70c268cf3ef/96050425176.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=little+black+boy+hairstyles+for+long+curly+hair
    • 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_off00012d9b.bin
b4bbccd9b65282c96fee2c917e06acb1176f855f28d6856ca4082e4009899d6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9B 11020 bytes
font_01_sfnt_off00014742.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14742 16792 bytes
font_02_sfnt_off00015f54.bin
5c6c9cb9ba5b726afe1dc114878ff62f38b65cdea11ebc507cd3540939b4846a
pdf-font-stream PDF embedded font (sfnt) at offset 0x15F54 17144 bytes