Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4f9812c03647d69…

MALICIOUS

PDF

95.1 KB Created: 2021-07-04 10:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d800f4fd65187c09846d12c822c175db SHA-1: 002530f46d615749dc3bef98e7f8465095db8402 SHA-256: e4f9812c03647d6995691e26bfff543093414fb689e4c2bf6754a5b887ecd334
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/8b41a7fe09377e02259aed82c0cd43e3/lesatez.pdf
    • http://championshipsportsrings.com/clients/23492/File/82352621921.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/6cbf354b4a51ba585377eaca1c0e4f16/45399467668.pdf
    • http://e-kva.ru/admin/ckfinder/userfiles/files/masuteguresis.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f79b25f5cd620b7f83c6b97c48331b94/70062152979.pdf
    • https://ubranni.com/uploader/files/41235084295.pdf
    • http://cortabellanews.com/userimages/fodabuvoworode.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/40508a2c8a3446b073bf0ccc318989b5/73489153665.pdf
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/gixufebupuxulef.pdf
    • https://eternalbliss.net/file/27245512158.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/960eea1a66d6cc8c784196082163b62d/55564692236.pdf
    • https://bishopsalamatkhokhar.org/userfiles/file/32798647397.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d35915f78e---54323321982.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/ae12b756963a054222728baab6683513/29179484642.pdf
    • https://soechi.com/userfiles/file/29772779806.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd0ba64f4f9---kibetolojijevexezovuj.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160add0ce6bad7---fugifod.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/a7f633f67a9ec4c6ea28c9c2611fff43/12317027191.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/2685bf65316f75f81bd40afcf54e6d88/vurazaloxa.pdf
    • http://lookkorea.net/userfiles/file/75678800380.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a68551f07a---86268318985.pdf
    • http://plncse.hu/php_data/file/tukivo.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160721ef10eb41---80522191248.pdf
    • http://dissanna.com/temp/fckeditor/file/2788127442.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/b7a0672c02f08db5fdad5deed8a0a1a3/xikezuzenenesobopowilud.pdf
    • http://extintoresorigen.com/images/editor/86769867426.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=wood+shear+wall+design+example
    • 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_off0001102e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1102E 16792 bytes
font_01_sfnt_off00012840.bin
de26b9dc636ee35ccaff11784150e2b23be1bf5b21a6cd451dbe1bb39748da7f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12840 17348 bytes
font_02_sfnt_off0001564a.bin
4b38784de9fce92a60d8f892010354427110f437f7bb75a2ac64a2011ca81c14
pdf-font-stream PDF embedded font (sfnt) at offset 0x1564A 10924 bytes