Malicious PDF — malware analysis report

Static analysis result for SHA-256 4baa4acaf245f4bd…

MALICIOUS

PDF

72.0 KB Created: 2021-09-02 18:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d11bcc51631cd053c05f483af29c884 SHA-1: c73c8536d9ac9a8d8a3bfb9d95aea385caa5415a SHA-256: 4baa4acaf245f4bd6bc16bb3c7b4beb0bc294be68f0d883a0baa76081d176e44
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous compromised WordPress sites, suggesting an attempt to distribute malicious content or conduct phishing. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the detection indicate a likely spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4326

Heuristics 5

  • 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
  • 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://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c54dff474445721f887c5851c0ad0db7/mufedaxusajibagafi.pdf
    • http://xycrusher.com/d/files/26627689296.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/d3933abec174d947c6058e274f55e21d/87642384903.pdf
    • http://envigest.cz/upload/file/nufakimo.pdf
    • https://pametnidom.hr/pametne_kuce/userfiles/file/tekole.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1610e1f0123e06---59113187080.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c927486a34---63168120700.pdf
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/e3b5ec3913e202495e2c0a29fe2ddb9e/98830730002.pdf
    • http://classicalgardenstatues.com/uplds/file/lufimuwavapufej.pdf
    • http://miyozenemeryville.com/uploads/files/73736218484.pdf
    • http://ateliergermain.net/sites/default/files/file/xupumozemivosugibatasal.pdf
    • http://a-pluset.com/userfiles/78677007367.pdf
    • https://successalpha.team/upload/files/tijerelalowulowuxix.pdf
    • http://katyababash.com/images/uploads/file/96268712741.pdf
    • http://flyingcarpetclementines.com/userfiles/files/sesuliroge.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/q0022ejcnj88u5fumbmj70r2ef/sobusaxavibosokejitekuful.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff0221298c---rituxiziniwowovemexajure.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094312fd1c44---sulivepogogulo.pdf
    • http://rzn-house.ru/upload/file/tizowaki.pdf
    • http://daiichibus.vn/uploads/news_file/ginajan.pdf
    • http://bigxra.com/uploadfile/file/2021051517025473499.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a71fe6b9ab---dujeragopawigijapigabeva.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e995e648f2---raxaberogodadufisukipit.pdf
    • https://aplusadvance.com/naver_editor/data/file/35533867999.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=1987+honda+fourtrax+250+service+manual
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d481.bin
1dd9a4a907ba80d181809c1634f3e9fa580be66aef424e45256064031e82c065		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD481 17356 bytes
font_01_sfnt_off0001013e.bin
ad331fbce3cea2857cee5f50dd9489e5377b759a05a3444c45ed9507cca087ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1013E 11768 bytes

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