Malicious PDF — malware analysis report

Static analysis result for SHA-256 25983fbc3d6ec0e0…

MALICIOUS

PDF

91.8 KB Created: 2021-06-28 23:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ed68732a51c00522863cf5c77f21242d SHA-1: 061210c43e6b6773e417f57274472ec740baaf73 SHA-256: 25983fbc3d6ec0e028b711627a79f425506cb2c9315cc5cff5d43dad645a407c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The document body is unreadable, but the presence of many external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://atek-ent.com/upload/file/tofemuxeronemezizoxififa.pdf In PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160beebffa3765---zobigosefugijuvujusidis.pdfIn PDF document text
    • http://charontrade.hu/data/file/migamok.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/733c8f9f7bf977fa751e298d68fd71ff/dalatujovilibexo.pdfIn PDF document text
    • http://navigator-33.ru/media/file/gezunutako.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/mab7sd53pmahoib5c6q920dn40/tixax.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4797c094d7---17226437229.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/0ceee0668e5a13bbbc508b53453807d4/41224834873.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/24636c414b914b4c8f4ecdf122a4086f/sasegebafako.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/36f41b3471627db7dcb807b49db81729.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6fae2b507---5291180932.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/sekosoni.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/a7bae9af6c2a56ea51852f7d4ce2997e/jotupibuf.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/9sp0a7a9t1v3e7dgpiscmuncab/gixilibunixiguboven.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/kumuseb.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb2e011db0---91409490165.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/c9139f48803ff4fc3f5bad0ffdb83e1a/deguk.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/b323592b63e35cdea04a7edbdf7f080c/lifez.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/rupixe.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e293bd2d9f---xaxuvijesivij.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/j8rd3nbhs6ru486slmk50la83d/70768634181.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/sajovewexuwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=clinical+significance+of+creatine+kinasePDF 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_off00010128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10128 18044 bytes
SHA-256: f263af3b920c4ede093cb912b7200ed6a11e49443ce1e20628ee3c3743e2f99e
font_01_sfnt_off00013149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13149 10636 bytes
SHA-256: 99d59d7f1fd5633565180be2ada1833dc6b696eb646a8d2839844a8924cbeb0a
font_02_sfnt_off000149d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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