Malicious PDF — malware analysis report

Static analysis result for SHA-256 f10d0dfc5234ef3d…

MALICIOUS

PDF

77.4 KB Created: 2021-09-08 08:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 60df5e8f6ce8b18dc14a9ca2d2780752 SHA-1: 4657bca180b9134496a7f451ba1e46d73e836849 SHA-256: f10d0dfc5234ef3d8f29d7468879b2739647b03a7c4d390c2f79cf503c7ca717
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the overall structure strongly suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=paracetamol+poisoning+journal+pdf PDF link annotation
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160949e4d9942a---68063986354.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/14523700251.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/jawovetur.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210902_C0BF37419FFE3AEA.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/zofaze.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/perixulexifovedakikafag.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/2728262444.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1629855919giwaxivalabinatowoxin.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/232250371186.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/194e18b7d95bce77871a502ac90ef534/jumoxor.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/45948038402.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/29f06b36557aba81a82012f37406259d/83649075906.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/8bfcca138e19c39219ca29151c7b44a8/97267736303.pdfIn PDF document text
    • http://allycatering.com/userfiles/32963103402.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/61967932593.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/sitipake.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/sefek.pdfIn PDF document text
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/zudaku.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/73149700051.pdfIn PDF document text
    • https://mmszke.hu/files/file/wedujiv.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/sajupetidelenekadaxeboli.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/lifiwigefikenamewevavot.pdfIn PDF document text
    • http://candientushinko.com/images/file/8580362458.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_off0000c987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC987 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE199 17068 bytes
SHA-256: 1148eea86db8b3b4f4606f935234885f524638997dd99845e7981175e5e8343e
font_02_sfnt_off00010da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA2 11196 bytes
SHA-256: ff9dd30ee3736865214160e05088fca042202581d8e3ff6f70047e7d70334d72

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