Malicious PDF — malware analysis report

Static analysis result for SHA-256 7349c72ac2b0fd75…

MALICIOUS

PDF

81.1 KB Created: 2021-09-20 05:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a7b08470e3ec8f5070cd16aa46aed803 SHA-1: 7c3094aa62e850222a063c752c1cb5c92e87a547 SHA-256: 7349c72ac2b0fd756dab5447d52c128b9a431e83ed1926fcde7cd7fd0a623fda
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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 https://huntic.ru/uplcv?utm_term=ronin+wallet+for+android
    • http://skisun.it/userfiles/files/bigobudafivaxakepegora.pdf
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/161351a698ae6c---34332164886.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9830bb1c5---68800179059.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/d4rcsft3vdouur6bqsvqkmbs92/6448798031.pdf
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/moviluvosubepasatumuse.pdf
    • http://parentini.it/userfiles/files/misukatumesuvazelovudovi.pdf
    • http://ceramvetro.net/userfiles/file/62327613731.pdf
    • http://nexxosrealty.com/userfiles/files/36912503728.pdf
    • http://bogaarchitetti.it/userfiles/files/mizezarebomajuwuzipo.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/161303669e1165---88677232313.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136110e86fc2---6348110556.pdf
    • http://bosch-elektronarzedzia.pl/catalog/file/tofukagadep.pdf
    • https://immo-cjeanpaul.lu/userfiles/files/51382411227.pdf
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/xonetapolurotabo.pdf
    • http://francescofesta.it/userfiles/files/24849954346.pdf
    • https://liepasmuiza.lv/userfiles/library/12147080977.pdf
    • http://madinaboys.com/easydo%20v2.00/files/uploads/wumunanebiruful.pdf
    • https://7mark3t2-7aya.com/contents/files/27939749913.pdf
    • http://studioindelicato.com/userfiles/files/3856978553.pdf
    • http://standardamulet.com/files/files/58890713312.pdf
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/zovapis.pdf
    • https://hoya.hr/UserFiles/file/somulefuj.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_off0000d83a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD83A 16792 bytes
font_01_sfnt_off0000f051.bin
af7f38cc1de19e44d9329ece53615be793d24db01ac358a32d73633a44c082c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF051 10312 bytes
font_02_sfnt_off000107b8.bin
eb3287d87552cbe79f376e58d41b4d45982cf440a1eb362b9ad63693c01b6f68
pdf-font-stream PDF embedded font (sfnt) at offset 0x107B8 18172 bytes