Malicious PDF — malware analysis report

Static analysis result for SHA-256 a29b1ce70f0c2b01…

MALICIOUS

PDF

88.3 KB Created: 2021-07-06 20:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: abdd19dff4d86ea9317d28a623bfd901 SHA-1: dc7d390eaa1d58c000ca86a9368dc7392830d532 SHA-256: a29b1ce70f0c2b018144f286c3c3b9fb7ca4a398f30bdd1cc4f54efc0830d81d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to host malicious content or redirect users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of embedded URLs and the nature of the heuristics point towards a phishing attack that leverages compromised infrastructure to distribute its payload.

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://crewmak.ru/uplcv?utm_term=child+support+confirmation+letter
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ab383e385---lakikevakozataludili.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983d8ee8540---42931359211.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/57453ea0202a5d7cf80f75ee679ed53e/85993239589.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812782bdf22---sulikiwizetigisogelakemix.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606c77dd569a4---tisovegaxobutinuwuniful.pdf
    • http://sumosushingrill.com/uploads/files/15072837814.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/79a36ecbc19a392041fbd1ffb6074ebd/49369078416.pdf
    • http://katyababash.com/images/uploads/file/zagufojuloribemorane.pdf
    • http://alkanboya.com/files/file///13328619713.pdf
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/69262896451.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bca9814c5bd---bumexuvunabuleromiwugusuw.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c380b66c5---86076351526.pdf
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/jevosubuveposijagowurow.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/e23770d9cd6007d7408c169bafc60e9c/30820829203.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a21b112bcc---makosigaleziximekozede.pdf
    • http://best-infosystems.com/userfiles/file/pulugeraxuw.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609724564d6a7---30659588841.pdf
    • http://aite-materials.com/upfiles/file/67177681540.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b03bbc5ba---larolenofezajekimetavis.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/d18d41a336bba904bb0f67e17e674dae/19839025296.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/9r9lo8haed4vu8ulr9c7pqvv35/pisafazonokuzejijulemiwa.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d7fdce4b3---25579081613.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/b2il7cp3b0r9v46o0vfc445ecm/zifimurelupafi.pdf
    • http://sewakendragroup.com/userfiles/file/xotitogotonujuxaxuro.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1609b576401a9b---33063764212.pdf
    • http://studiodabo.eu/userfiles/files/tusopowez.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_off0000f5f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F2 16792 bytes
font_01_sfnt_off00010e09.bin
428bef9ead25d340e94f4244cdf4be9a588ad25e58da45f074c0f954a7b89cba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E09 11016 bytes
font_02_sfnt_off00012770.bin
4a5b4463a27b399b74cbed919ab4ee6b41d652c28195a0e1ed780ac1a675dde9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12770 16988 bytes

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