Malicious PDF — malware analysis report

Static analysis result for SHA-256 204a7c5fb618f61c…

MALICIOUS

PDF

123.2 KB Created: 2021-09-16 21:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 964ae93be2be0245020f78cdb4594e3a SHA-1: 11db195907ae5de6bf372ce5e066cefe148509ec SHA-256: 204a7c5fb618f61ce6467ebd6374307f70ef0262fb926a14c96de09fa8b15424
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://ketchas.ru/uplcv?utm_term=emoji+on+the+phone
    • http://www.gieskestukadoors.nl/ckfinder/files/files/nixorurokituwak.pdf
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77088390884.pdf
    • http://wedooverseas.com/userfiles/file/84293896586.pdf
    • https://snapstudios.ca/userfiles/file/22059778924.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aeda3e0bf4---21913941025.pdf
    • https://maychieuvinh.vn/upload/files/98015053637.pdf
    • https://podiummagazinenews.com/ckfinder/userfiles/files/84727988860.pdf
    • http://warmistore.com/userfiles/file/fipadovabop.pdf
    • http://antasboru.com/guvennet/resimlerfiles/24606249507.pdf
    • http://tortsurprise.ru/upload/redactor/files/67654846391.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d3fd31ea6---79820410478.pdf
    • http://reklama-kemerovo.ru/files/files/tapewipilovorumuvemisedi.pdf
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/38068309456.pdf
    • http://chaukitchen.com/uploads/files/9318812925.pdf
    • http://kwiatmetal.pl/userfiles/file/10897686644.pdf
    • http://artattack-concerts.de/files/file/51744151927.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d22f030833---91808670687.pdf
    • https://oolong-dining-co.com/webroot/editor-uploads/files/75901603996.pdf
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/57541139077.pdf
    • https://euinsuti.ro/app/webroot/files/userfiles/files/wijidakunaferasavawog.pdf
    • http://zatoodesign.com/userfiles/files/9588566404.pdf
    • http://bogaarchitetti.it/userfiles/files/39478549519.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_off000171c1.bin
435d46821adbfbb27712791a2f5f7c31c8648092b370dabb36665078e4135db7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x171C1 24144 bytes
font_01_sfnt_off0001b0e9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0E9 16792 bytes
font_02_sfnt_off0001c900.bin
db400e839a70594772d63f5cb26770434136db7f376003c05da51871af3633ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C900 10156 bytes

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