Malicious PDF — malware analysis report

Static analysis result for SHA-256 594724493e7593c7…

MALICIOUS

PDF

78.2 KB Created: 2021-06-28 17:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f890fe65cf99a2099f11714d4672fe3 SHA-1: f53aa0b883edbd0fdf5b76f4fb63c74175c12d5f SHA-256: 594724493e7593c727a6a6edd99374e9102656cebadc660c6ff1a1fffb46f856
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites. These links likely serve as a link farm to redirect users to malicious content, potentially for phishing or malware delivery. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c93dd96cef---vabozix.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa53d93350---70493999433.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a857e7dc4d8---1575488528.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5f648f411---50936273172.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160a9975f43e52---1806435044.pdf
    • https://plasy.com/uploads/file/26094525357.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bdbbc3a36---lugidezakutun.pdf
    • https://reaga.net/js/ckfinder/userfiles/files/pulaxulofegax.pdf
    • http://amphorabeautyclub.com/campannas/file/wozimotolawurupujamota.pdf
    • https://butchercurnow.com/img/shop//contents/97110265643.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb484a2fc5---womedoduneloxaditom.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/h8lt1uuvs1e9g5640it3blnm16/23603048808.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/68s9igii2oftfbejhnhhs9gkd2/13766840329.pdf
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/26585632342.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607f245e60978---porulodabuwerepugevizibi.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/359c23ac8c2533141c7cd2f54f2f5e7d/63933718528.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099dbd6610c5---konodenin.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6128e3dc0b952f96159b75cfb04611c2/nedewe.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/0eef62e39688bf347681e2451aa98019/88080373474.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/a51640338619dd6be8d17891359b1a70/45427892151.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/3c4535d6d18124b607699da71a52c4e9/14854958547.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/72887807f1d2d3657e0a0dc24c59e4a4/87950188282.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=tuberculation+in+pipes
    • 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_off0000cfaf.bin
ee527bc993b29b9f3b4f47b7acc630abdfe5c0cbd1b26f9d411e3d708ae36a98
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAF 16440 bytes
font_01_sfnt_off0000fa5b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5B 16792 bytes
font_02_sfnt_off00011272.bin
f043dc1c44e04c0fbc6d7bfbe2618c5d355b4db907d76bd6c03e9b582b08498a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11272 10572 bytes