Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b9b64a3675bf166…

MALICIOUS

PDF

80.3 KB Created: 2021-09-12 18:37:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 196c20874d301d81074c468b969d062a SHA-1: dc28d4c9930ae3cae3a9276a3644861fabbcbc9f SHA-256: 7b9b64a3675bf1667a28a7186b27e3b6fac5e41c743598d14dad6d509e80c3d3
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://lagerunda.it/public/upload/file/tabovajuwafoganobadizu.pdf
    • http://sz-nuoyi.com/Upload/file/2021090522425356274.pdf
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/lijegejetiseru.pdf
    • http://kolbiko.com/images/uploads/file/9890256847.pdf
    • http://slenderclub.cz/ckfinder/userfiles/files/75098270349.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/22ad2677ee8e1b15fb1d9914bad0d8f0/30701674153.pdf
    • http://world-green-hope.com/uploads/files/76293373169.pdf
    • http://alda.pl/ckfinder/userfiles/files/xutewaxusoweb.pdf
    • https://raljob.com/userfiles/file/gigubaxavupibojefe.pdf
    • http://futboltotal.net/images/files/12176321801.pdf
    • https://djennebeads.com/nbloom/fckuploads/file/binal.pdf
    • http://khojedu.net/userfiles/file/momotizamotutusof.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/8gcuqq54g0pdmfq0j7l9c5s2pa/kajitulotowuxiwovubaz.pdf
    • https://xpress2.eu/ckfinder/userfiles/files/rakejakox.pdf
    • https://umartravel.com/files/57984092830.pdf
    • http://meandnetworking.com/ckfinder/userfiles/files/ketoka.pdf
    • http://grimastone.ru/files/73970270684.pdf
    • http://artgraf24.pl/userfiles/file/86683590569.pdf
    • http://zimmerei-possert.at/mafanu.pdf
    • http://hermandadperdon.es/userfiles/file/dibukut.pdf
    • https://oasis-travel.ro/files/14021756610.pdf
    • http://rebeccaosborne.com/uploads/sagubinezarose.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137b050a3155---rogotafexusobi.pdf
    • http://gartenmessebau.de/uploads/files/junibo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=call+forward+specific+number+android
    • 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_off0000d4c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C0 16792 bytes
font_01_sfnt_off0000ecd2.bin
074b2df2b40ae861a61c2d72ff4b06d902d09d5ae51ecc678270e51640d5dc48		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECD2 17272 bytes
font_02_sfnt_off000119f9.bin
2da74b75c5b7801103900b87aefa4c0d3d783c54928dd5ea91d94b571c89e0bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119F9 11040 bytes

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