Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffe41336e3dc0b5b…

MALICIOUS

PDF

86.1 KB Created: 2021-06-28 22:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c434b2c76ad0a74b6551fe35f7d1e937 SHA-1: 0697794fdfeee3313fe748c164195a2ddcefcf73 SHA-256: ffe41336e3dc0b5b773f64d0f69add92993372363e3ee354d9fbd7acd60373f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host and distribute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://krisoc.ru/uplcv?utm_term=how+to+draw+a+girl+with+umbrella+pencil+sketch+step+by+step
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a681840c2ee---jebumapotipubu.pdf
    • https://dadrarad.ro/userfiles/file/foxuxepuregewulipedumag.pdf
    • https://marljivo.hr/UserFiles/files/zinijomolevir.pdf
    • http://cipetbhopal.com/webimg/files/wijulalofosipigu.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/72r38k2sre5kgidh5ijclel9la/pegilavopegivilig.pdf
    • https://miguktour.com/FileData/ckfinder/files/20210617_2D2D7BA8E7C346AC.pdf
    • http://phayaotechno.com/UserFiles/File/46338040058.pdf
    • http://litho-and-co.fr/ckeditor/upload/files/83991415898.pdf
    • http://accessiblevehicleservices.com/userfiles/file/19843919007.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/6a069851f96f90d509895b2191dbdda3/koxewej.pdf
    • http://tgtech-auto.com/userfiles/file/93022072100.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/c263eed08c4616410e2709ad9f8e3af2/57788503963.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e12c0fb60---xavutikemi.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/36i8cu26ufjl6drp8use5v3u09/14620118376.pdf
    • http://nfc.soo.jp/file/divipirobupusurugegevi.pdf
    • http://webinside.pl/userfiles/file/tezotubizus.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_off0000eaf0.bin
87620be552ec1714344b4c1091d55bc7994907e6d35d1b450db63fec87b9e2c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF0 16928 bytes
font_01_sfnt_off000116b2.bin
5084940038b3e84a614d75d2d649f6d326db172573115d6e6de454e62227829f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116B2 11484 bytes
font_02_sfnt_off00013143.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13143 16792 bytes

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