Malicious PDF — malware analysis report

Static analysis result for SHA-256 a447e3316cb13df0…

MALICIOUS

PDF

76.9 KB Created: 2021-09-14 14:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b1959c6259e77f69bbcce96cc1b43559 SHA-1: 24630c8d58b0b0a090abfe361d05d2a2ef95c511 SHA-256: a447e3316cb13df08d34506c80204d0f96b41320a34c3291dddb0ce62ec2e4b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://smidgel.ru/uplcv?utm_term=123movies+online+tv+sites
    • https://toyotaautobody.com/ckfinder/userfiles/files/bibotaripasuboluwodi.pdf
    • https://kentacademymiango.com/userfiles/file/2853138962.pdf
    • http://caopump.com/admin/userfiles/file/gowojuvafutaxefutobi.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f847ad01c5---ratanetazudidajekupiba.pdf
    • http://bn-biz.com/userData/board/file/90487413595.pdf
    • http://flirdining.com/uploads/files/texazusapaselututoba.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/d941645ef3cb9a3493d78d6dee03dba4/vuwijewe.pdf
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/27220093894.pdf
    • https://jotekonybakterium.hu/userfiles/files/mejinajonikoli.pdf
    • http://musthighschool.mn/ckfinder/userfiles/files/1547553071.pdf
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/69921677164.pdf
    • http://djk-winkel.de/images/uploads/file/81251749077.pdf
    • http://conditum.nl/userfiles/file/49969910567.pdf
    • https://stijsr.com/userfiles/file/ludupexigalelam.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161328b3bb4311---bujovusepexamanil.pdf
    • http://islenapuntos.com/campannas/file/mexinifuxizu.pdf
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/rilabomexobid.pdf
    • http://hodori247.com/uploads/files/mofutisevekajuv.pdf
    • http://llux.vn/uploads/files/jusepifufi.pdf
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/zuzeloduremuvutewa.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613cab00cb7ec---xaxosowatojitajalu.pdf
    • http://www.sudaff.com/pics/file/kenosuwaresexejowakanevew.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161354895c88cc---ravawepa.pdf
    • 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_off0000ca0e.bin
5b85802a3c0e3f7884621a9520cb060762165f2f9065941e7d3ce3dc3336ee54
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0E 10320 bytes
font_01_sfnt_off0000e161.bin
a2f518b20921251eb40249ecf06100970e0bf248e37a699d7a5a069967a51088
pdf-font-stream PDF embedded font (sfnt) at offset 0xE161 17364 bytes
font_02_sfnt_off00010e51.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E51 16792 bytes