Malicious PDF — malware analysis report

Static analysis result for SHA-256 9586b163bb7a2d10…

MALICIOUS

PDF

87.6 KB Created: 2021-07-29 19:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ebb22574ce4d0c6c8051e4862fa2046a SHA-1: c7ddf380bf2be95b6c73e48028a2cd89f0e0f5d4 SHA-256: 9586b163bb7a2d10a6d4b804f217e7ab19aec8ae9076e0ba572ea129031092bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. It contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS upload storage or disposable hosting. The presence of these links suggests an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://ruta.hu/ckfinder/userfiles/files/68984700418.pdf
    • http://hnspkjx.com/d/files/36990519505.pdf
    • http://allprintusa.com/admin/images/file/tilakeputefaguj.pdf
    • http://sola-brothers.com/userfiles/file/lozuvixe.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c65b6c49662---97322899867.pdf
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/86681809243.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cdbeb2ff8---39434109184.pdf
    • http://fitsiluet.cz/data/file/geberovafigiwatowomape.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b754a040195---vivedawefovuwuxelajipa.pdf
    • https://pakistanchristiancongress.org/userfiles/file/bavarez.pdf
    • http://erbaytag.com/resimler/files/bopupu.pdf
    • https://www.tvmreza.tv/ckfinder/userfiles/files/14674787956.pdf
    • https://daynexweb.com/upload/ckfinder/files/kogijepaxap.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2348141e---66714730293.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a967419aa---44768128432.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3e45d690c---13774589.pdf
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/76991934392.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160952038875ab---87223831956.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a4f5a7455---88379031691.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160982b663a4ac---7105987486.pdf
    • https://33mobility.net/uploads/files/39126324824.pdf
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/5180850097.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/0026152039cd2c6fa4d88110ef372e84/67945128228.pdf
    • http://infrabud.eu/fckpliki/file/zafudejuvogumobugiligiwe.pdf
    • http://velo.hu/UserFiles//file/76123958580.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/2a7bd0e25758d392267ab7c5a5314431/pumulezanu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=red+lobster+menu+prices+ultimate+feast
    • 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_off0000f060.bin
37f925ede478ee6187cd070bd376c2e3ef090b257eecff91f14cc0bfac8dbdf9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF060 17928 bytes
font_01_sfnt_off00011f64.bin
3d9a3c71f19d7964bcde88cc70b6d0d674da04bf17b469915afa0873b59a23fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F64 11064 bytes
font_02_sfnt_off000138e9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x138E9 16792 bytes