Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf329b3a72b8f00f…

MALICIOUS

PDF

88.0 KB Created: 2021-07-24 13:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d1abb1916e5692462d3e1debe13f5bb8 SHA-1: 0601dc21c54299c6bcf1c1888d5b4b3dc19e9235 SHA-256: cf329b3a72b8f00fe634f842667a6e3f86175dc95826cfec8a77fb882b0f6b32
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised WordPress upload directories and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or SEO spam. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://3e-recycling.ru/app/webroot/filesfiles/35168347090.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160ae438d73c59---90523467886.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/griqdhn3aqpnnr8shnjfrfvfbb/20746027344.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16079b0bf10487---nuroligadudamomodas.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/9jrts9q4t7q2ipee1a4ff84ajc/99461081493.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/4cc0cf7b48952b32e0f33e09e42414dc/29287532573.pdf
    • http://szintai.hu/ckfinder/userfiles/files/lozupebisetojimef.pdf
    • http://tscyw.net/userfiles/file/20210713045813_ra9ams.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077ccef56ca6---tamorizepagafufazigesetuz.pdf
    • https://ladangmimpi.com/contents//files/25759925358.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b90a91171---50502099487.pdf
    • https://digireg.cn/upload/puwatu.pdf
    • http://ceramicaartisticamarsalese.it/userfiles/files/datizixibokusimadukoj.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606faf3546faa---borasedutemabijawabesarer.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/hprb39iup5nu5jj74s9eie304r/41195613830.pdf
    • http://aquatherm-graz.at/files/42865356288.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e25906414---71974029769.pdf
    • https://mimpi1pusat.com/contents//files/76886268179.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfbba0d405---garawefog.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751611c61ab---34925894338.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ffa7b177d---nojud.pdf
    • http://osteriailgalloelinnamorata.com/userfiles/files/31643277640.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+do+data+analysis+for+qualitative+research
    • 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_off0000f3d8.bin
1d6ea75956c4768bf13779230d7b65795522d799c433990742b9868498a4e48f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D8 11076 bytes
font_01_sfnt_off00010d70.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D70 16792 bytes
font_02_sfnt_off00012582.bin
bd341170871573be18882dd29ef8f3f596edd1bbd6fb504f1f44fc32b5756f09
pdf-font-stream PDF embedded font (sfnt) at offset 0x12582 17004 bytes