Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b8a82edc57f92d…

MALICIOUS

PDF

87.2 KB Created: 2021-08-13 23:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3e0ba0e69ea5cfde7abd433725d68bca SHA-1: 239cbcde4bf2e8279ebeaac4d3354dec57263fb8 SHA-256: 81b8a82edc57f92d4a1b96fc08a6516bc233e4909d46ea82e3d74aaec97b51ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to malicious external content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

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://inwebjor.ru/uplcv?utm_term=armando+hasudungan+notes+pdf+free+download PDF link annotation
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/tepixukiko.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/24690116977.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607b24bc54539---73637366142.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc15d5d56a---26219213104.pdfIn PDF document text
    • http://xn----8sbosgn1al9i.xn--p1ai/ckfinder/userfiles/files/53684451542.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/5834574724.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/192c8048739306f924bb3853bf738088/legageroginewutaloz.pdfIn PDF document text
    • http://proxima-design.cz/files/file/nunenageget.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/7c4e288103966e906d180859ef7397ec/gebizotanaruvuzo.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/5074807404.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202108060456299497.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b6498ae524a---58812398237.pdfIn PDF document text
    • http://myafmc.com/clients/a/a5/a51d49d85de18111a3d718c63a5e5081/File/78759240145.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/14495106729.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/jenapixipufosigikobim.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/8d6ac7e0f130c57c18f94276241b4a00/vilarovafazosiwilixalu.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/u93c8aupud6gmg5c1rab65c25q/rusoruginirisibew.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/xekikedasopak.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/waxigaliludutujawexiwi.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760d4075c93---80469597512.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64150585401.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/22085657741.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/1obt0bvlkjdc47376l8ceaj32p/tofoxixu.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c322d0078c4---15227382331.pdfIn PDF document text
    • http://abnicum.com/files/file/95830158647.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16081045e3930f---nufipegopar.pdfIn PDF document text
    • https://t.me/afratafreeh2In 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_off0000ed2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2A 11020 bytes
SHA-256: e28df5934688cf0ef423b1728f8e95b268014af5df2fec47e0965ba4f5ad4360
font_01_sfnt_off00010677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10677 17788 bytes
SHA-256: 01141463dab4f9616d6c54c0983db6ef1de9e683ddd93e1d623f268b20a3f9d4
font_02_sfnt_off00013540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13540 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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