Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5f93672bb9ef38d…

MALICIOUS

PDF

136.0 KB Created: 2021-06-25 19:36:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e4fa2386670e776c19f6c8e746b604ab SHA-1: 98e1eb85690c5f9cf74f545c941003e94216a8a3 SHA-256: e5f93672bb9ef38d09e93b56321c0d121eadc62d353cd1f3e7e4656e37051a65
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple URLs, many of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure and the nature of the linked URLs suggest it is part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9228

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 http://kuhomania.ru/ckfinder/userfiles/files/molegixewetowig.pdf
    • http://hainescentreasia.com/images/file/xikefi.pdf
    • https://lensprovn.com/ckfinder/userfiles/files/zamep.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a19416e5142---80758074656.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b59218896c6---48408964989.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083116157790---82068859803.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/43d04aa915b22dc8d7edd2afe1dba7d2/gobofav.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/faa03fc4efabf6622989722b78251501/99146545935.pdf
    • http://novussiteyonetimi.com/uploads/file/28123145601.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/faa63f9094bbc60813f47d3127b58ef6/25084816505.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4043c9058---32484680845.pdf
    • http://globalroomplus.com/bot/ckfinder/uf/files/ketamukavidezonumuzeseri.pdf
    • http://au-coeur-du-temps.com/userfiles/file/4860752493.pdf
    • https://study4student.com/cache/fck_files/file/29659194085.pdf
    • http://engineersclasses4competition.com/files/others/zuzavuzomojubovuz.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/63ff328411d9ba45d0a86dad1af9f66f/duzerotavasoneg.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bc9c9e881---16162697413.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/f30392e9a2a9e7ff977b99667f3ae839/javebimi.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/dfg4qldl2dq3djlq56vboc7dgk/xudebazazejutadudekopus.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098713dcf1a3---rabipapupanokupotom.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a52e468fe7---37372687747.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/mshgksft9v8k7u35n8ntbs53kb/xiraderuwapijinupaloz.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/o75atkcg5420nlt4j3dmpu74ug/50536293930.pdf
    • http://banglatalkies.com/dynamic-images/cms/file/19239071764.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1b6481806---64738808414.pdf
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/f298123f83dd6ebb4bc17f38cb52f2e2/maturofejadepeturiwawov.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=best+1v1+champion+lol+howling+abyss
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a6e8.bin
47bc7b34f05ef7551ddb3bf71025f6a56a92b857cce0c7d546f321f5f264aace		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6E8 11232 bytes
font_01_sfnt_off0001c0f8.bin
562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C0F8 1860 bytes
font_02_sfnt_off0001c9aa.bin
429da265ee6fbd2b87a73ae62506a8ad7ff701b8e83edc3defdb75b2d3a2e087		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C9AA 18568 bytes
font_03_sfnt_off0001f95a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F95A 16792 bytes

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