Malicious PDF — malware analysis report

Static analysis result for SHA-256 54841da0c27f1b6c…

MALICIOUS

PDF

82.6 KB Created: 2021-09-06 13:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 050aa46bf0a57d37f3532de2e812f403 SHA-1: a197fb9da34602ed15162ee471fe1eecbfc689be SHA-256: 54841da0c27f1b6cea20c879ddf96c029e49e12097e2c7583dc32d6aab92fe74
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f980707c4e---95070712900.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16129b334a57cd---96792006090.pdf
    • http://pension-erlkoenig.de/img/editor/file/gawizabu.pdf
    • http://ecofincas.net/ckfinder/userfiles/files/5743241654.pdf
    • https://ans5680.preneed91.com/upload/files/43530535770.pdf
    • http://tandprotheses.com/ckfinder/userfiles/files/vusupigajaso.pdf
    • https://wfca-czech.cz/temp/userfiles/files/44687150410.pdf
    • http://divorcefinance.nl/uploads//file/dumup.pdf
    • http://vijyaiprismcrm.com/userfiles/files/welezupuzebugas.pdf
    • http://kurdumovldpr.ru/uploads/files/68657749431.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089394c54d8c---71827495721.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/96233llc5fl12u8048h91s99l7/70065163621.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/f1669a296e397da95b598971a0647551/98606510204.pdf
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210706181131.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/bdab835728a3a6254bd94b2390cc2c7a/37675685222.pdf
    • http://ural-resyrs.ru/data/file/1151849972.pdf
    • http://mtsskzy.com/userfiles/file/sabifi.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/fa9917a895142fd6014f52dcceb600a0/58302437720.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160c2777ed1df4---vexixilofi.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073ac10c264f---bagumasifabukukupeje.pdf
    • https://juvelyrikoscentras.lt/Files/file/wodudifagazivobike.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/ecc5d0f55bfdaccfda077238c594ce89/nakuwa.pdf
    • http://ablerexthailand.com/userfiles/files/63207938774.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=australian+english+dictionary+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://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_off0000db2b.bin
46b332a7551aca3d3d163582e4c82b29fbab14e188b1203e62be0f5378fd91c2
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2B 18384 bytes
font_01_sfnt_off00010af2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF2 16792 bytes
font_02_sfnt_off00012309.bin
6f671b709e680d281d0ac255b5793033e644e91d9dcfe7db63bf0c93d3aacd04
pdf-font-stream PDF embedded font (sfnt) at offset 0x12309 11096 bytes