Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9d7f291a59934b2…

MALICIOUS

PDF

85.6 KB Created: 2021-06-25 21:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef3859bdce7f5391f4f84f423f07357a SHA-1: 07e60baa15fd1481a852b78d3749c43f42fd6883 SHA-256: f9d7f291a59934b24b1cbfb5cf13114bbf7487864c0ed2c8c109314ac369e317
156 Risk Score

Malware Insights

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

The sample was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites. These sites host PDF files, suggesting a multi-stage attack where the initial PDF serves as a lure to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765e0f29771---dexojor.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd447f9b484---koxemorujakaf.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/hj12eeos2ojcdcd1bdcer7jntl/97931360250.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087c74435917---4575925091.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cfa7c610d---90119528535.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099c5d38fb1a---wixafowazipapokedizoj.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/3kvqrjn6dq4ck4ulot4ffrct24/jufepasetot.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a98926626e7---28302750017.pdf
    • https://telenovella-bg.com/files/34584868610.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad301b0efe3---zolejejitizajaras.pdf
    • http://heyumpnd.com/userfiles/file///xapefow.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/f1105784c050d03c6519beb9529348a2/pomedawozijatarolex.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607dba2e272f2---pijam.pdf
    • http://kinel-hunter.ru/upfiles/file/marumep.pdf
    • http://ahkkpcm.org/userfiles/josenoxasigibijitubiren.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a482d5dddd4---woxonejelijidifili.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/k82il27lnhbjp2iha72v14n3i0/sigadunasenudutenab.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe2a6ba7a1---maladopixepatawabe.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089ed2169c3c---sozujufuzebopaluzobit.pdf
    • http://elitaliaweb.it/upload/file/7832833063.pdf
    • https://maintogelonline.info/contents//files/84197643236.pdf
    • http://blbr365.com/userfiles/file/1621638208.pdf
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/66560295982.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/06fd46703996df2454c8431f8667a207/fejadepulonigaridaba.pdf
    • http://axwelindia.com/uploads/jomexigabig.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=production+of+chemical+feedstocks
    • 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_off0000e8f6.bin
951dab41a9d3442aec1164281310334cc96500dd409a99bda4f2b287564251b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F6 17580 bytes
font_01_sfnt_off00011656.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11656 16792 bytes
font_02_sfnt_off00012e6d.bin
d45c336f69aa0937fe31684c14acb82a5b00c6a3a6cb8631423c85555e73b9da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6D 10932 bytes

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