Malicious PDF — malware analysis report

Static analysis result for SHA-256 5205666b0972f345…

MALICIOUS

PDF

84.4 KB Created: 2021-08-25 12:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8861858562a2241cc3606c605cf4606b SHA-1: 8623ab71e96a7d02af3793baf57f85b17d95a99e SHA-256: 5205666b0972f3457734348d6a82f2e2df0bae933dfa1acbddb6de9960d6dffd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=gray+green+color+blind PDF link annotation
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffd8f0e5d7---mitigezagarotazunulupuw.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/kekomatimolumaneg.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/19693820331.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dca7d15ddfa---boginipotutagezujidiga.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/34229230077.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a08a390a801---dekavipikebifi.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c220202e1---pisomasekixugukubosalad.pdfIn PDF document text
    • https://dhesient.com/media/fegikabagasu.pdfIn PDF document text
    • http://cycling-software.com/files/file/xofesutoxi.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/10907388857.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/zulafuxesadegutixekomano.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/xubipix.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/76805174468.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/4e0109a08591851850a0558acb8c26be/mofikigavujamipabeje.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d29661cf4---4798208376.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/34326113986.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/91309878046.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/majazisag.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/zifiriwukawepodani.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/ajmfg38vpk0smhv59k7d64ujtf/67327191784.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/1952908801.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/8c9995f7126eaf6a451628e36217e64a/kowiwukiwe.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160d9f05a59807---gorison.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/xebed.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_off0000e3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D5 10572 bytes
SHA-256: 3aed253247ff5f6dd84ade5072549b077b571d3800bc17fe115ca16ad7f8444b
font_01_sfnt_off0000fbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EA 17464 bytes
SHA-256: 78ef867141af07b4952fd428032ff61fa10a3ca36993a88235d4210d232330b1

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