Malicious PDF — malware analysis report

Static analysis result for SHA-256 886f1ff53d7dd3eb…

MALICIOUS

PDF

72.0 KB Created: 2021-09-18 04:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 53474337da75d8179610b3d971b04bfb SHA-1: 6968ac02f3b4c186cd6e216b5e75c63b94aef461 SHA-256: 886f1ff53d7dd3eb62109f5957261af3f2a987989b5ab9ed90e177ee7a95d499
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress installations or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links indicates an attempt to lure users into clicking them, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crewmak.ru/uplcv?utm_term=traffic+tour+mod+unlimited+money
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/8a7401aa7edea0984c0bdcb79454e32f/semunigivitimag.pdf
    • https://clifestyle.net/uploades/userfiles/file/pagujabesimonariravifir.pdf
    • https://defi128.phpascal.com/userfiles/files/22506280595.pdf
    • http://creative-format.com/upload/editor/files/potilenafuzafozane.pdf
    • https://fong-cai.com/upload/files/67510204408.pdf
    • http://bernardthevenet.fr/ckfinder/userfiles/files/sefigirumibobaduvemat.pdf
    • http://geombiagioschettino.eu/userfiles/files/vadagutabikikoze.pdf
    • http://teewer.mn/ckfinder/userfiles/files/puzorebomipepuxufogowaxi.pdf
    • http://muzycznescyzoryki.pl/userfiles/file/77716531559.pdf
    • https://cuacuonbentre.com/upload/files/nibezagapazotidunamodizo.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c82b3d808c---67432374742.pdf
    • https://stradatextiles.com/upload/ckfinder/files/14695894950.pdf
    • http://ahcxdq.com/uploads/file/121908488672.pdf
    • http://architettoseneca.com/userfiles/files/12786448460.pdf
    • http://sigmabhp.pl/userfiles/file/wuxefelekojexebebibevuxe.pdf
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/32894923287.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/93844a7b7c7f4a4bcf9aaf6c8c9521db/fegekabes.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142fb4b21208---54070847017.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/f6732fea21b6664e35fa0cc5a35b022d/nopifofuvovuxibisofetut.pdf
    • http://okzawidow.pl/img/upload/files/karuvaneligebevelurovux.pdf
    • https://magatek.com/documents/file/13670370334.pdf
    • https://tigaintan.com/contents/files/kuzulenulodalojigekaruku.pdf
    • http://vasekurzy.cz/userfiles/file/vimetipoke.pdf
    • http://hidropro.hu/upload/20430475213.pdf
    • http://ruihuitax.com/files/file/gosoxosawininifiboxid.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_off0000ba03.bin
0a7e56c65fd8387969b6c12b33f8d1a805cadd2a2061b3e6a8c11e7eed0c12d8
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA03 15600 bytes
font_01_sfnt_off0000e213.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE213 16792 bytes
font_02_sfnt_off0000fa2a.bin
21f23d7cb9bff2d6f00c992f169b628060218f1452fe4ad31a18a0daa78aed0b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2A 10644 bytes