Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca73a6b3a7fa266f…

MALICIOUS

PDF

78.9 KB Created: 2021-06-27 06:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: daf55a2cf066316f9fa0f828cc396112 SHA-1: 7e86e466c48b5737b258e898c02da571832df10a SHA-256: ca73a6b3a7fa266fae2f0336c66fa6411e759f8817d3632244b48a978b9cf913
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://sergey-yushkov.com/pict/file/82342295821.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b57094a939---13610681335.pdf
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79802202648.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd051b6deab---78865748958.pdf
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26803014423.pdf
    • http://augustaelectricalwork.com/editorData/file/xemuko.pdf
    • http://dienmaythanglong.org/uploads/files/87705338657.pdf
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/3vdc7jrjnhvku6cqrqj3r4bfas/65942058436.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b306e852c---bojuru.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160768a11ced70---37688687297.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/9252a45e0e81a652aab0341ca216cff1/lumobebez.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609aad2d6276a---20446954833.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/jonmff2qekrt24g8hngv2b6hd6/fobekulu.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/pu7ov0fvn2hm92a572dlcu4lvi/bumoruxuzejuzulosugix.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160acf28859c21---pusemerivevo.pdf
    • https://datatech-int.com/userfiles/file/sewogipur.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/b770916fc0816f67a987cb4cbc32dafc/69002842377.pdf
    • https://kalyna.ua/sites/default/files/userfiles/file/2681184367.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/5a1ed14f83048da1a6cf4be995041095/duzodoke.pdf
    • http://wksystems.net/HotelEstimator/userfiles/file/84372480703.pdf
    • http://dollreunion2020.com/clients/4/43/4392dc7a9e9236654a628da0af121bbb/File/425452858.pdf
    • http://smclassof57.org/clients/34860/File/supup.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1a6f643d8---gijitolivipuduvatosumav.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=roshan+wilson+anatomy+and+physiology+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_off0000d160.bin
6cf50453e9605449f07ad240d1ad019b2c6471a33149a4cca24b8386031f8d8a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD160 10960 bytes
font_01_sfnt_off0000ea72.bin
505a734da0711bfc14a0ae8f32c146224dcecfcc39a1995689dcb4f16ab5b630
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA72 16780 bytes
font_02_sfnt_off00011607.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11607 16792 bytes