Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf734d45458a5638…

MALICIOUS

PDF

92.2 KB Created: 2021-07-07 00:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 633b23f1d004584d74a33cf5b0e79c2d SHA-1: 986057a43a91e2af197b36d8f7e81c639e6e9f88 SHA-256: cf734d45458a563847c3624b2fc27068ddf9366ea913acdcc5dabd3766009a92
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted from this sample, but the presence of multiple external URIs and the overall structure point towards a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=best+shooting+games+to+play+online
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0ad96daf5---47149346858.pdf
    • http://insureatkk.com/ckfinder/userfiles/files/20303364260.pdf
    • http://1yunnan.com/ckfinder/userfiles/files/raximimoliz.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2f9972a47---16810592806.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/tcb01alhql97r4d620rdp8lgr7/razuwasa.pdf
    • https://people11people.com/uploads/File/21390531992.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/i57ifdufgason9f5q3ulrj3ju4/kiminozafixasopavek.pdf
    • http://honda-vo.com/upload/file/37895228057.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/38b2cb72a9333d58bb3e5bc8664f8331/52140384751.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/99901370944.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960fa9270aa---81637748083.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ca030a2c4---33993520235.pdf
    • http://animationcoach.com/userfiles/file/pujixazabinuwazix.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/b8f518399297869f946cbb6aa53e139d/gidibo.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/fk9o6a8dd55grv3jv05t0qonj0/penuxujiwiroxoka.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607998bc302a8---21313107695.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/41aghh20gsca2tq48p0eq5ans5/wadakijetifuf.pdf
    • http://17njl.com/userfiles/files/65247300250.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac82875f5f1---68154182202.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/ccbjjro104g57r2lg9obi6rpal/31288788276.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799c1acea1d---fiwiwenupixa.pdf
    • https://xenang-mitsubishi.com/fckupload/file/buzadisowepusirokigan.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06848697dc---davodeviwatalod.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6bc51f2d4---9924430818.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606da48f3e48c---reradimabaneligimujemorej.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/6a9614edded8a8ad50eaad66b551a2b4/vexobovulovogoxowobowetu.pdf
    • http://fouladsazanco.com/Upload/file/gelovojiberojuf.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_off00010666.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10666 16792 bytes
font_01_sfnt_off00011e78.bin
ffe0a0187de55a2aefc4c61d0a6946bd80d32d420e32a6b5f4c4d6eaf79fc8df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E78 16880 bytes
font_02_sfnt_off00014a74.bin
00cfad58afd504cc10d5229636c6952b11f9df0a9af9f2fe5a3629894a2f311e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A74 10768 bytes

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