Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fb4eed7303844bd…

MALICIOUS

PDF

77.2 KB Created: 2021-09-23 02:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f224f7a04e561992d8a2f2087ec7bee6 SHA-1: 2758cce88aff99156832b2d465e5cffb45a633bb SHA-256: 8fb4eed7303844bdf11e8767adcd248433aee86496f4639fad4efa5a120dde25
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, which flagged it as a phishing trojan. The document contains a link farm with numerous URLs pointing to potentially compromised websites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate a coordinated effort to distribute malicious links.

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 http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/debamir.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/df71e6b4be8bcc2ddfe52faf03ebbf2a/6666815407.pdf
    • http://galeriejacqueselbaz.com/userfiles/file/risatoxifun.pdf
    • https://afra24.com/basefile/afra24/files/65299512244.pdf
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/29758741860.pdf
    • http://musikpark-live.de/userfiles/file/lozudajasosazulerosadiji.pdf
    • http://lienming-rubber.com/uploads/files/202109052110585779.pdf
    • http://nanoscopy.ru/uploads/files/21715719118.pdf
    • http://goldstecq.com/userfiles/file/81819329442.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/0bf94584e770c77f2523f17bfff0b96d/bumawujiranobagelisegem.pdf
    • http://www.dean-cpa.com/files/adminpic/file/bunazoguruzijarafuxow.pdf
    • http://hnsunnyfood.com/d/files/61811581712.pdf
    • https://muzpony.de/obrazki/file/88006705048.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161361dcdf1b20---80176202452.pdf
    • https://vongtaytramhuong.vn/upload/files/35112913423.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143925c6dbd8---48331976536.pdf
    • https://obrbikes.com/files/files/siwutinulef.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=bubble+shooter+3+game
    • 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_off0000cb13.bin
e5df1086a35fb315a8a1cf3a317ce5946d64ec3559ca28263054f1614b474893		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB13 16740 bytes
font_01_sfnt_off0000f682.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF682 16792 bytes
font_02_sfnt_off00010e99.bin
5141b96ced23e031817c0c701d070c63f61a9492588be11fdcfbcc74fca468b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E99 10824 bytes

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