Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddf87fd3a6194d84…

MALICIOUS

PDF

79.2 KB Created: 2021-08-27 19:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 362a46a67d7da6ec76493813f80371b5 SHA-1: b7985d239a1ac67d084718e0c28f08cdcec9e822 SHA-256: ddf87fd3a6194d84bce4604eb79d11a1a2293e5db8de18984b204392f9c177c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, a common tactic for phishing or distributing malware. Heuristics indicate these links point to compromised CMS uploads and disposable hosting, suggesting a transient infrastructure for malicious activity. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://medvor.ru/uplcv?utm_term=calculus+with+analytic+geometry+by+sm+yusuf PDF link annotation
    • http://londonjip.com/userData/board/file/40189158700.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/41436563558.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/roddggou5g1r4uc8vuppolp55k/59224125924.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16095b8344bd5e---38311369270.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8343af3c8f---lajaligunojanil.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/votite.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/fejerememorulegovalu.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1611bd33cc6398---volevufojusonerimifabafum.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/kapitakiwategos.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079b4979cf30---28620044380.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/sitovajumukovajutu.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/80541002744.pdfIn PDF document text
    • http://msiutilities.biz/documents/92589865919.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c520c9b642d---dudowabogovilil.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/952928427.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/nagupoxobilutowo.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/tedegexexo.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d27a66a6fc---58701422130.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/7429687282.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/farinerediwilogiloza.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609be5e726a4f---neluwopusuvo.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/mnl7eh9giksq2ghq47pfbvgbc1/vakanivekapute.pdfIn PDF document text
    • https://jagamimpi.info/contents//files/99696741062.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_off0000cf0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0C 17316 bytes
SHA-256: 0eb210308c71ded2b79a60d6da9265c146f15050273d3bf743aaf3eb5b966d85
font_01_sfnt_off0000fc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001145e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145E 11252 bytes
SHA-256: 80cd3d9512b2f0d9dac3243bac3eb0333d9cf4f9e393c4cc209ccdbd66e1f5c7

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