Malicious PDF — malware analysis report

Static analysis result for SHA-256 9891753d43768233…

MALICIOUS

PDF

96.3 KB Created: 2021-06-26 06:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 69bac352470ec03e9b3117061752b2d2 SHA-1: 38b6b32e3b6ce75ff90890a7f342e1262863703b SHA-256: 9891753d43768233da0b2a81cfb564b031185f77d68f455f4b22996be35fe816
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4fd3319cf---63387419428.pdf
    • http://tele-video.ru/upload/files/18122153038.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/sugubavesemuxatojajori.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f01168c862---32629208535.pdf
    • https://clinicscrm.com/img/files/sivinubuwanalimoselamu.pdf
    • http://umrllc.com/userfiles/files/fasixodatadi.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16093476d93ed2---83179301439.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/inl1d5rq3ge7dt3aenbo9aouk6/43706753487.pdf
    • http://mulroyenvironmental.ie/userfiles/file/mafanelu.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846b8b171b4---32215201612.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/d6b152f59469f5759c15451155372a51/79459745607.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e67c09cd2b---474997895.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3f446190d---22782314035.pdf
    • http://yasairamenbar.com/uploads/files/kepimuvuwox.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a13568d00a4---91917519597.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/onu1cn8n3tgv3f2sr4bm5rktg8/gumewologopawu.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/kedaga.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a632c88a35a---29701421347.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/57dedl7ogsvjf9pu91n3en2kc2/demazemanujowo.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949cc40e296---mifuwulenewaxonovejosil.pdf
    • https://moto-trend.cz/public/files/fck/file/nedoj.pdf
    • https://alternativecarrepair.com/userfiles/file/56198359434.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/b681ba6d9fdf205bfac42283cefed8ca/56112687955.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3195bcebd---10197769189.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/qioemf8mkhe8ffo7pqltl5oep2/xiroledugudorixos.pdf
    • https://dadesigning.com/daduserfiles/files/51928367175.pdf
    • http://karmand24.ir/basefile/ehotel724ir/files/61646777972.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=reese+witherspoon+and+jennifer+aniston
    • 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_off0000f8b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B0 16792 bytes
font_01_sfnt_off000110c7.bin
a7b8583db2ce133999a4fa49a5c0cdc6a928513c19b87050730dfa13be48cc58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110C7 10808 bytes
font_02_sfnt_off000129ab.bin
58526d1f3ca9c951a459ab23c8a385729c230f2255138c17692820f8ac0a3cbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129AB 19200 bytes
font_03_sfnt_off00015a44.bin
4b430873c1355c07a7b6fc2a85d497e3939b341190f8238bfefd207250e34e94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A44 16516 bytes

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