Malicious PDF — malware analysis report

Static analysis result for SHA-256 52b8bfbb414e1d93…

MALICIOUS

PDF

90.8 KB Created: 2021-07-02 08:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 405fbea47076641062aff22c0ff5df52 SHA-1: 3fe5433f1da0f2b150893faa9dee059408457e10 SHA-256: 52b8bfbb414e1d934fb9f2d714825857cc56e9ba46a053c0d11584e47b890260
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs that point to compromised websites, likely to lure users into downloading further malware or submitting sensitive information. The presence of multiple compromised CMS upload links suggests a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ketchas.ru/uplcv?utm_term=financial+accounting+the+impact+on+decision+makers+10th+edition+pdf+free
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/52fd83108e401a76aa9ec8714d506602/bazosusovageg.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/0af7cd9edcfd9902c25bd7563dcac416/88077970024.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704cb717be5---50156933598.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16072bc841c1be---62857844025.pdf
    • https://airbays.com/userfiles/file/xodotosuxutubugogonajitor.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086306d2b5b1---batep.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8112a1616---xedimoluwutor.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/6c9441e77f9ec88e5438ebfb7bed2d44/xanenax.pdf
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/2121675510.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/a861f60a7f8127882bf636d37168cba0/80715281664.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/79de97b9bc35d1c5a81870a3e033a13e/60669808642.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c80806d0e5---58414589547.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d235ef7ad3f---67622475157.pdf
    • http://nexxosrealty.com/userfiles/files/97801767307.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/tikoxodurujon.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160d80caf97e88---pufepufonidixeruk.pdf
    • https://balaji-technology.com/userfiles/file/80121825808.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c238c2ce5---waviginurujema.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a0340b5f527---zifirukimatakemat.pdf
    • https://sailstudy.in/ckfinder/userfiles/files/gogojaz.pdf
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/5584e27050d3a54e947c272fc9e3a677/56306359301.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cf277a050---dimujoj.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/42dafbfd7b4ae2c2d1f06398dd0d0ab4/pujelodalazosirilevitibi.pdf
    • http://falerisztika.hu/tmp/47620953580.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/0e88hrpajeb10q7o41dcjrjcsi/28416742205.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe78.bin
612c6dc96aac73c442d2d01a8e388c2bcf2062bc2b48bc93b38d332c9acb72d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE78 16896 bytes
font_01_sfnt_off00012a6c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6C 16792 bytes
font_02_sfnt_off00014283.bin
1772bb9bafa14391d707e383f1879324de44baa07447500f8060cfe8e946d4c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14283 11408 bytes

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