Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ef414bcdf4efa5…

MALICIOUS

PDF

78.8 KB Created: 2021-09-17 14:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5f3241bce208d806a970f843afab5f60 SHA-1: 09668b85b2e06870ef2715e6a70416796ced47e5 SHA-256: b1ef414bcdf4efa5ec0b86491306411ad1244550abf55f4734e476729abd86b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm hosted on a compromised WordPress site, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this file as malicious. The embedded URLs likely serve as redirects to malicious or phishing content, suggesting a spearphishing attachment as the initial attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/bf4f3df4d38ae49b50460a6ad8562314/lunutut.pdf In PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/73942606848.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/13968020506.pdfIn PDF document text
    • http://heart-calligraphy.com/uploads/files/202109071559346244.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/vufedilat.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/dadexuwudegigokolexubuka.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeda46423c---xebobixuvidunojofux.pdfIn PDF document text
    • http://medi-sen.com/files/files/7199706614.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/29002704152.pdfIn PDF document text
    • http://special-pharma.com/upload/files/30594170921.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/jobelunavidale.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613222f593763---26039262279.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/9250917040.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/merivijuropoturoxad.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/zasiwovelesanupalipenu.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/57401973471.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613503ca989c2---30349003803.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/toruguzuforido.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/10094362103.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/nakivifidutilisiga.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/rakosixadebejumawugu.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/kopawuvatoxagegemudozoz.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/q4felv2gpeanroa1h5jt9le1f7/kupuwukesa.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/87013570904.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/1ecej00bubdflog0bqktqan9gk/83639327830.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/sazixisipojesozed.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/28079525273.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=fancy+pants+y8PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C6 17684 bytes
SHA-256: 376c1288353acebdc30b5569b4b8c93d1e4279de0e7b03420257480a45c8ccec
font_01_sfnt_off0000feb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CE 10176 bytes
SHA-256: 53e856d5969e7cc80eb77fd91e9e174c55c6b41237a543f4f48515d147fd6b90

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