Malicious PDF — malware analysis report

Static analysis result for SHA-256 deae4f18b0ef4329…

MALICIOUS

PDF

95.9 KB Created: 2021-08-10 01:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 97fe50013ff5ad66d7ee0c80b2f24ff2 SHA-1: 6798344f675c2d20a6f758bd9dacbf2a83811b2f SHA-256: deae4f18b0ef432906d33e6af2433f617b175412c3069aced2493a8638f093a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised WordPress sites and disposable hosting. The URLs extracted, such as 'https://catamma.ru/uplcv?utm_term=adobe+acrobat+reader+pro+dc+free+trial', suggest a lure for potentially unwanted software or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://catamma.ru/uplcv?utm_term=adobe+acrobat+reader+pro+dc+free+trial PDF link annotation
    • http://ledseoul.com/userData/board/file/rapokixonivubatafip.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/c7211532e247cb8e61b241053b38d6fb/jolekezuzitezatevigida.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/641aada94cabe89963d06d3585daa259/derivanemuzinajefirojo.pdfIn PDF document text
    • http://eichler-kammerer.de/jotejavo.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/xofofufivopinesogo.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/julipovatigelilo.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc70af11108---80575321007.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609889ae87b7f---zimibetat.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/nulotozukubimawalob.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/24679466597.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa27b6a35c0---kepunefosufulisonetepuv.pdfIn PDF document text
    • http://zubrcup.by/files/files/22584258154.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870a907bc71---85925004713.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b10e0154fec---wapowujumimasogoleborov.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/58b38c5926d2d3fec2894eb24a726859/fadij.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/kenalebifemolarato.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/30989921113.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160add180df6c9---34987791545.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071ecd294233---kakitem.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b754d634abf---81921953225.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897751c21a0---7958629465.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/masujebopegawoma.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/24425813555.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/89638801110.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/7ipsjh39cjppmjq81q6e004fqm/bodapibukef.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/zolopudolipuse.pdfIn PDF document text
    • 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_off0001115b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115B 18028 bytes
SHA-256: afcfc55482d69e78519000a0178b0fae54059a8c17433bfaf6fadeafdaa684d1
font_01_sfnt_off00014103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14103 10460 bytes
SHA-256: 0ea3808d0c62f31dc05c0cd50d337a062a7927724a7aeca7a3a2035111be5094
font_02_sfnt_off000158a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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