Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b1720b7432dfeb…

MALICIOUS

PDF

77.1 KB Created: 2021-09-08 10:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7bd70955ad578e9a7176349e75e0ecb6 SHA-1: 76c68687ca28aeb5f851ef87c901d6925ed05848 SHA-256: c8b1720b7432dfebbef121bb74ca499807da68d69465ae44ccdc55ba3c858568
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 file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate that the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://oncallanatomist.com/ckfinder/userfiles/files/93445394786.pdf In PDF document text
    • https://fid-data.fr/app/webroot/uploaderfiles/72234047135.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/48012364702.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/ed543ce31eb8ceec71df8a45d56c19e7/14452631633.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856b6a84952---duzuwema.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/605efc87c99e40a591876a77639ecab1/14086683833.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/69419810653.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/36774216178.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/eqjkgug86e6fpcn939mg1htd14/48394918182.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40248a78c0---lurew.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/bd3540a6534ecb7f3796dc88073744cb/wewuneledijigijinofolu.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/66408898457.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fa6099d5a---26118939517.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f74a1c6ea---zejetal.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7625eb5b6f---42186118061.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/32855657673.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/muxafitezetodojejuzurafik.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/71703595336.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/tazob.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/21941645400.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/pogabiwogerodeg.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/53834431144.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/kijusipufokaxanupewajusa.pdfIn PDF document text
    • https://cmetrix.net/ckfinder/userfiles/files/jevotukabesokup.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/3ea795fd284534441caaae18d46b88a1/wisufafikerofemubixila.pdfIn PDF document text
    • http://krzeptowski.pl/file/tukovu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=wintrobe%27s+atlas+of+clinical+hematology+pdfPDF 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_off0000c6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C4 17468 bytes
SHA-256: 1f23ff26bf8360697184b6ef061420d6842de19c4a06cf13672d0dd9dc1e87a6
font_01_sfnt_off0000f42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C46 11348 bytes
SHA-256: af538458eabd6f597a997a6d889118826506541b7c2839a83ce05a5914eb3e9c

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