Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6481575e5daaeb6…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 01:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 47518fb2d7e3a56b5951c743d09a3c26 SHA-1: 5796d5c60c5b413e93fdf844873ecdcc38afdf71 SHA-256: f6481575e5daaeb69ca70a42554ee6c7727d4585277471f7df04f26e4ed0ced9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised websites and link farms, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs are indicative of a spearphishing attachment, aiming to redirect users to potentially harmful content.

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 https://medvor.ru/uplcv?utm_term=engineering+fluid+mechanics+by+kl+kumar+pdf
    • http://benthanhsgfarm.net/images/uploads/files/tororimusez.pdf
    • http://hawaii-resort.info/images/blog/file/worivoguxetilebemaw.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e48c8d4bd1---rokonovan.pdf
    • http://scpt.it/userfiles/files/jewepewi.pdf
    • http://asavn.vn/uploads/userfiles/files/texawibikitovel.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/121990c3a0e9f06a49ceea5c7d0a5f49/zotamo.pdf
    • http://tetobox-budapest.hu/uploads/files/xitesaxovumikibujoz.pdf
    • https://izyskately.ru/foto/ck/files/6268086112.pdf
    • http://rideabikenews.com/user_img/files/89144699852.pdf
    • https://culturasiapamplona.com/guiarte_userfiles/files/50293715737.pdf
    • https://cometsecurity.in/admin/userfiles/file/dijuralomomosuw.pdf
    • http://makesomenoise.hu/upload/file/xejuxadogunigosuzefotu.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-9-10/20210910220823473931.pdf
    • http://pnmanagementsolutions.in/uploads/jateweridutotulamimelune.pdf
    • http://dobrejaja.com/Upload/file/vuvobote.pdf
    • https://cezartravel.hu/userfiles/file/rokipibadawudoliwazetar.pdf
    • http://standdominica.org/files/files/zifobinanizavimaj.pdf
    • http://turinhotelcompany.com/userfiles/files/63460294262.pdf
    • http://thepducphat.com/upload/files/vopaze.pdf
    • http://paliukenas.lt/i/File/64612141809.pdf
    • http://shipagents.nl/uploadfiles/file/pimuzipon.pdf
    • http://trunglamdecor.com/uploads/userfiles/file/66195088135.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f87ffb99f4---69595807723.pdf
    • http://vigova.vn/Images_upload/files/visiruwamokigitofulokux.pdf
    • http://mh-gartengestaltung.de/userfiles/file/61519611760.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_off0000b249.bin
ec4eb2e65b311827470aa806dd046f1eb44c6e20172770d30fdb33662ad656cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB249 15556 bytes
font_01_sfnt_off0000d9e6.bin
0fe21996b59df8dfa584b2dbd58b6faa6884fd9845dc18929db9681d32f7bb5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E6 11276 bytes
font_02_sfnt_off0000f3c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C0 16792 bytes

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