Malicious PDF — malware analysis report

Static analysis result for SHA-256 893132a2f80aa507…

MALICIOUS

PDF

104.7 KB Created: 2021-07-21 16:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc12d8dcc1fd116beccc53957135ebb4 SHA-1: f8563a09bc67f7c0da3064246d7ccfb82fe943bc SHA-256: 893132a2f80aa50756ad7c6b8c27a9c5bb93cedf83bcd18b65eaa8045851b99d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to multiple external URLs, some of which host further PDF documents. This structure is commonly used for phishing campaigns or to distribute additional malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://bijverhoeven.nl/uploads/files/77492989031.pdf
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/1134221479.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/764c22c1d3ba63216a187f0bb186a6ed/bufebo.pdf
    • http://adams-gold.ru/archive/image/file/18990569690.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/amn08msk4h7jpmu97rmtte3ak4/75912964172.pdf
    • https://igruppe.no/ckfinder/userfiles//files/89402505050.pdf
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/00na04gd1kfu0dscddkcmc9egg/gubufibezodineriv.pdf
    • http://dolphinkorea.com/files/files/fifujutefad.pdf
    • https://xtrafitcoaching.com/www/images/files/72102870299.pdf
    • http://ventilatoryzlin.cz/images/file/luxekeminipifivanimesab.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/0nl4io6h3hcme9u10sncsme11f/76030776086.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/2626f929811d479ab3abc8400b250968/8373873960.pdf
    • http://fullcolorspandoeken.nl/userfiles/file/76124091719.pdf
    • http://cambresisemploi.fr/ckfinder/userfiles/files/kosekusavat.pdf
    • http://seoulsquare.com/userfiles/file/35398079648.pdf
    • http://ajivikafinance.com/userfiles/file/gefefelivevusetugunavad.pdf
    • http://autobedrijvenindex.nl/images/uploads/tekerotowo.pdf
    • http://softwarefactory.nl/images/file/25424185033.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e635c2cd732---zugegazukexudimulakijekoj.pdf
    • https://tonitomov.com/picture/file/20488788401.pdf
    • http://www.jindatunnel.com/up_files/file/lamusatenesewegixi.pdf
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/44439042568.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=tv+and+movie+quiz+and+answers
    • 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_off0001375f.bin
299cb5ee5cf515641a6d3e19f0c0016babb527b2c324e55a0c24ed2bd2c82a1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1375F 10684 bytes
font_01_sfnt_off00014fb0.bin
07c5ba964f5404713db0b3b0ee24aa88dbdb2e480fa5825f9533d7296be654f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14FB0 17332 bytes
font_02_sfnt_off00017cab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17CAB 16792 bytes