Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf58fcd1520c9a6d…

MALICIOUS

PDF

79.8 KB Created: 2021-06-29 01:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e99571be135671026317d1d7444f5f19 SHA-1: e6bff0d226b2efc64ef3532412f117605e153847 SHA-256: bf58fcd1520c9a6d64375c328472442f8f6fbd9e4b27fa8270569abd3106d8ab
154 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple compromised WordPress sites, a common technique for distributing malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of numerous links on disposable hosting suggests an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6259

Heuristics 5

  • 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
  • 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://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/1n67togs25tcn5ukbcn2vl9jq4/luporasonatevovepajiremu.pdf In PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcf1d9d0da---55547787178.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/pupuxazikejedo.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a5328cbd4---64780121897.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/buxadu.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfd587d513---rexibef.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/27a17a15a9185a590cc11e2c813a021d/vategelod.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/0ddafb55efef66ba1bb816d222130800/nelolopuk.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b838fde5c11---14174189655.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/g6fuskhspvskp8fpmpv9nmi11m/lazoxoru.pdfIn PDF document text
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/luzokonorimusikenonewe.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c08f4213fc---25580620032.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad506c6ff3e---49975587810.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/litixiritujebis.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/32742324852.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c14fd48bcc6---82765909422.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/5f56m4elccjjepcr4pof67n0i2/zunafeb.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f858b47f9b---sexududarej.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adab096092c---zuriwudimunofixiruma.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/941g9mr619325vpr0afou421kv/38574407480.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/51973482991.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/a666491b0950d33375e5df0d886fd2f9/sagozajazavetidowupebut.pdfIn PDF document text
    • http://topas.lt/userfiles/file/79218488592.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+use+a+compass+rosePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10639 22092 bytes
SHA-256: 9a0c2e91eea867ad4e476ec346cd1a4af0162603c8b880b9e99029633a65be76