Malicious PDF — malware analysis report

Static analysis result for SHA-256 426a1760e2b36c76…

MALICIOUS

PDF

82.5 KB Created: 2021-07-16 03:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0972ad3d1b8e6778e17e6ca818b97219 SHA-1: 2aea3e4aa33d053234cdc30fbe2bcd88f417af46 SHA-256: 426a1760e2b36c7653a2f2153459d6f3f03fe30f142c2541ef3a71a91ddcb3c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing or trojan variant. It contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab164c0268---balabub.pdf
    • https://najlepsze-w-polsce.pl/uploads/2492415656.pdf
    • http://argol-editions.fr/userfiles/file/tazogit.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/4caf3b18214c1b808bf835969762e3db/34757586616.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085236926109---garezafulox.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/f1b7f4f5e18db472100354ed81143e51/35943577213.pdf
    • http://acpiindia.com/userfiles/file/24384393528.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d28ebdf2ae---21883587049.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/skh0cephf4492hkkf17a15opd5/kovoke.pdf
    • https://dadrarad.ro/userfiles/file/2019975384.pdf
    • https://rosenstein.lu/userfiles/files/96191824433.pdf
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/a95eorsju3lnqpp8m9j5jrks4s/volumibopewotupenijijami.pdf
    • https://ivanamihic.com//files/12952027292.pdf
    • http://tpdw.pl/userfiles/file/xosufakowivetonu.pdf
    • http://pnktools-th.org/ckfinder/userfiles/files/jezipufiz.pdf
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/rorekilewumepuribepefem.pdf
    • http://sl-light.ru/design/img/upload/file/13396044627.pdf
    • http://eurekaelearning.com/upload/news/file/lugibowalapodi.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/2maut41aqqeb6id5974tq5fca5/vawivasebiravodesatexepa.pdf
    • http://abwplazaview.com/uploads/files/59570421829.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/e2dae12143f9a182d78b308aaf7b02d1/45061622022.pdf
    • http://schokozentrale.de/idata/rokugazifofo.pdf
    • http://chrisdepanneservices.fr/Sites/cds/files/pevasad.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=flowers+on+shoulder+girl+tattoo
    • 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_off0000e426.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE426 16792 bytes
font_01_sfnt_off0000fc3d.bin
6859b0e96cb8d87861aa37a37c81f54b1fde2c2dcae7e66c09cce542e00a687e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3D 10688 bytes
font_02_sfnt_off00011480.bin
679b6dc6f000472a25e447d119ad90dd247f5cb5a2c6a99c7097ee41474bfdc0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11480 15820 bytes