Malicious PDF — malware analysis report

Static analysis result for SHA-256 47b43b92a6de96c9…

MALICIOUS

PDF

79.0 KB Created: 2021-09-07 11:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 01cea88bceca20f613e92c06c0da7162 SHA-1: 546c16ea753257a7706e3e5345fa590fb08c01e9 SHA-256: 47b43b92a6de96c937c5469b7ecf2cf3a56beba6a5e4b43833a063255a23214f
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URI heuristics and link farm indicators points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.adom.biz.pl/ckfinder/userfiles/files/49111746670.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/161282ccf38812---18458667591.pdf
    • https://www.nitdgp.ac.in/uploads/userfiles/files/lokotewo.pdf
    • https://anfauglir.com/images/file/dofuxudenimo.pdf
    • http://belovosushi.ru/files/tizumomogurox.pdf
    • https://sona3elkhair.com/userfiles/file/16989386531.pdf
    • http://slxiang.com/v15/Upload/file/20218211610294553.pdf
    • http://a-mega.ua/images/uploads/file/jetozazemegugowuw.pdf
    • https://langumeistras.lt/i/File/44797548640.pdf
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/92144699547.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/90ea4f03e37e111df29134b9f6274c88/kutorarig.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c30c33380---rufiwalujagiz.pdf
    • http://sanzmendia.com/userfiles/files/titerowozoruge.pdf
    • http://oinworkshop.com/clients/6/6d/6d9161a7191ba42f41383a85782e2f4f/File/xikuku.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/9f2352b897977c5eeedab4b7abda7a95/wisumanomerokenudibuxazor.pdf
    • https://ajitcoatings.com/uploads/kofabezavumibejis.pdf
    • http://nsfeed.com/_UploadFile/Images/file/xidulabuwowujelapixun.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160adbc5c52e43---5229220355.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/7861fff9d8b6ee09a1cfb3102e53b78a/20266505651.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/773d2fddebba107284cd72735e36c7b7/22600497433.pdf
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/bugejubanekuxonejanezowut.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/2urijijf42sijl8ndva7k2vh8k/48874574675.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/be69bf9133c123513c6ba27527fb4759/8049652308.pdf
    • http://immobilieninvestors.org/userfiles/file/gonofibijereba.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=managing+anxiety+and+depression+worksheets
    • 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_off0000d2e8.bin
752bc6074d177cd7103a4ac6c8b470b075ef387202e2de323b6309078aedfc3e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E8 16564 bytes
font_01_sfnt_off0000fcbc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBC 16792 bytes
font_02_sfnt_off000114d3.bin
b3893dea89ee81b04c633be7f6e657033e77d15a5ee630045f995ca0b98f3cd6
pdf-font-stream PDF embedded font (sfnt) at offset 0x114D3 11012 bytes