Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d343121addeceb…

MALICIOUS

PDF

68.9 KB Created: 2021-10-03 22:16:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08f85ea91ce50b097b5fed3894561566 SHA-1: 4256a8a5842245f4c8d224b8bf4f66100f738beb SHA-256: f1d343121addeceb8b8aa9ecd4b72c00ad8c5dda35959de55f4a5de696632c02
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs an image lure, a common phishing tactic, to disguise clickable links. Heuristics indicate it functions as a link farm, directing users to various external sites, some hosted on compromised CMS platforms. While no scripts were directly extracted, the PDF structure and link farm behavior strongly suggest an intent to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://olivier-daulte.com/ckfinder/userfiles/files/samito.pdf
    • https://rubenferro.com/userfiles/file/pabenixulafuzonar.pdf
    • https://cleartunemonitors.com/ckfinder/userfiles/files/86878191162.pdf
    • https://profix.fr/ckfinder/userfiles/files/43023355924.pdf
    • http://naosgym.com/userfiles/files/25650293210.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/fu7b0u53jef9j7klsuhg7fu3tm/67915287568.pdf
    • https://bozoklar.org/ckfinder/userfiles/files/47688852731.pdf
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/43171033832.pdf
    • https://shreegroupco.com/userfiles/file/resemarunagavufizipageki.pdf
    • http://systemsbiology.at/uploads/assets/file/67745238183.pdf
    • http://popmetre.com/news/files/kimimujegez.pdf
    • https://venusnvs.com/userfiles/file/buvolagi.pdf
    • http://vwtint.com/userData/board/file/6485360565.pdf
    • https://didacostruzioni.it/userfiles/file/74244996588.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614b8814bfd68---17541611789.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/daa31ac435f12e3ab863d86f399e36f1/42150802174.pdf
    • https://owop.challengersports.com/userfiles/files/65768097327.pdf
    • http://www.nena-artspace.com/ckfinder/userfiles/files/4546078774.pdf
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/rakafiwojiwo.pdf
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/61552945761.pdf
    • https://dobre-akce.cz/media/files/file/volukujan.pdf
    • http://baove24h.info/upload/files/48806537321.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=homeland+security+presidential+directive+7
    • 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_off0000af0b.bin
26391859a2d9e8398b15026be6e0880f0c75c02e04ad19ab7c579205db82a115
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF0B 14192 bytes
font_01_sfnt_off0000d255.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD255 16792 bytes
font_02_sfnt_off0000ea6c.bin
77c0d9d9c10f99533fd0a9c84d6569eda06ef76eb3e1a21e2df4565bf0f08440
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6C 10996 bytes