Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcaa032107c7ec7d…

MALICIOUS

PDF

99.5 KB Created: 2021-07-06 03:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ccd0639a7c2a016026beab09b644f06 SHA-1: a12f7078aabd69cd8b4389bd9fc3e51268c56892 SHA-256: fcaa032107c7ec7dee185560694fa698ce9e93b01761beb04bb40727f9ab0663
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed for phishing or malware distribution. ClamAV detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95', and the ML classifier also flagged it as malicious. The primary attack pattern involves luring users to external sites via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160764955b255f---webobumukavivubidonufove.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083e95d86805---90059346438.pdf
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/xejufegopazofigup.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607dec299f4b9---vujolodapirawed.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/45e01a3fb3caa61248e6bd401f0d76f3/jewefifekiwewamisip.pdf
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/xejiva.pdf
    • http://www.aluvascientific.com/UserFiles/file/74080147121.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e227e5c12f5---rituvakegasupaduzesok.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773287ca8bf---21401921277.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/cdabb485a76934dc2d5a7083dde5def3/77346270177.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725bb39e115---40085532825.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/rtnknbcftfdshkilphm416mp1e/2688232398.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abab091adfc---sipesomuwavotubagene.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/b17885d9a3839787212ac449dab7d847/76060918248.pdf
    • https://victorybear-info.com/userfiles/files/37911802083.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160851fcd30ebc---vabujux.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078c281c8ccf---vipotin.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/6st30nal9i6cv49opkhhuh1rkc/96081466659.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/1f5a0ae1671b192358b6096a8347ed83/10650969384.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/79cfe1a4d7bb2677f797375eda42bab7/lejofagipudavejaxopatadu.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160754bce1b590---82355798628.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bda80796e8---22282911284.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/2510b9fb8d8f3edbb5e6d8aa7d1010ea/tivexiwasekoj.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf41c3c5aa7---keluboxugalajoramozof.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160872ae9ea73d---23174987210.pdf
    • http://hanasushimenifee.com/uploads/files/demaxumafof.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=meaning+for+personification
    • 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_off000123a4.bin
2652bebd7ba10dc7580a648a9cb554656859fb937d2fe4f96316f7a7f3eaa563		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123A4 10600 bytes
font_01_sfnt_off00013c00.bin
34ddf56a00bc129c6b421e71b1bf4ae12d0e8d690a27181cc869b2620da5305d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C00 17284 bytes
font_02_sfnt_off000168d1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x168D1 16792 bytes

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