Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2a926b0d67ebe23…

MALICIOUS

PDF

79.8 KB Created: 2021-06-07 00:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a10272e88847dddf29bf822f45f371b7 SHA-1: 16fc00254a378458438de02c9c3ff1f8bb1f9d25 SHA-256: f2a926b0d67ebe2303f1814e536296c41c26478dddf60b090534e00231f8b3d8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample contains embedded JavaScript, which is a common technique for malicious PDFs to execute code. It also features numerous external URIs, including links to compromised websites and link farms, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://infrive.ru/uplcv?utm_term=english+multiple+choice+test+upper+intermediate+pdf PDF link annotation
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/181d423324e9e4b0d4ee9290a0e5c724/30256596965.pdfIn PDF document text
    • https://artenika.pl/fck/file/xesovirilaruzavakuleso.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/31223886757.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/f63dacddf22e19c7179a3abdda2ac12d/91496271390.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fea5f24ae---meboviruk.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16078976e57896---46504725206.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608c714e7b9dd---47208837507.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/30c25e79775cace00afc2f58a8662031/36094622172.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/sebavafinat.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e13f16e34b---30489966732.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160890fa9db124---16183502856.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-6-5/20210605120207414120.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/2d88dd289f4c769ff03f274b19539527/nawugiwipid.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/pavewofazekoninop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC39 5408 bytes
SHA-256: 9d976ac8bee90644b4c8b4d7a649e4e82677f2cbc0f38160919575437ef8f0e8
font_01_sfnt_off0000de65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE65 1832 bytes
SHA-256: cd008f8d50b352213f06ba1f4b1b071cd966d7a6c71acff1aeabc275819a8311
font_02_sfnt_off0000e742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE742 10800 bytes
SHA-256: 942d4af52e2766426b08fc383fb9ea67c0690a40c28a8cc3a793f8328861aeef
font_03_sfnt_off00010c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C34 16508 bytes
SHA-256: bf0029f2f65a8d03fc5bc6dac3f89872448ee76276b38fcd79a4881ba082e330
font_04_sfnt_off0001229d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229D 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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