Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0d6a3fceb155dd8…

MALICIOUS

PDF

84.6 KB Created: 2021-06-25 18:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 20d74542515ef97e28841559b1a14db6 SHA-1: 3092eff3677e5a1beb665ce0904a2c02f0f37aa1 SHA-256: c0d6a3fceb155dd8609d017b6a92c67bf1ad50620514610a23ed7a9014be0119
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be redirecting users through a link farm to potentially malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://medvor.ru/uplcv?utm_term=stand+by+me+uke
    • http://www.tokyomagic.jp/images/library/File/lewazufolifen.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/fbgng30vqmjud1bb99h87rslu1/45885489499.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/56dda679cd939f9611d58aafb0dc9450/wobuj.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6947d0bd48---26714721955.pdf
    • http://imreelectric.sk/uploads/file/98285910954.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45ba3a8943---xeferaviwonufowoxigez.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b5a478aff---lirudibukuxibapatavan.pdf
    • http://brandnewgoods.net/userfiles/file/bunuzepubasivomukofozi.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/nf6msegjsvh4n011m53h5q8n48/90070301401.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a36d22bc1f5---bazimor.pdf
    • http://dieta-plus.pl/userfiles/file/vunegeruwitirinuw.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b2c0e9ebf---gojaxuxanutawis.pdf
    • http://fine-cottage.ru/userfiles/files/fuzawekilefovekudak.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/37a3c0bf08a558b6b71833eae5d33aea/85278541936.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/ugu0j2eqqp2j454hq5bi7p1k86/pofaku.pdf
    • http://araonline.hu/uploads/file/kewuveduxifogefur.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/99f13d26d67acb262e247a480b154235/jimewexux.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/27c26d6c9d736c7b625ede7b90aaaa8a/nexorodaz.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2ba45fdf2---nerixifab.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3ae4cae32---musevaw.pdf
    • http://belhavenhighschoolalumni.com/clients/13962/File/65408014138.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/qclnro940d0je1r6att767clu8/tiropikukikelemor.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/4c54c46d50ff3e646920d042e728679e/12152110902.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b67ab23faab---gurijaxuxafibamud.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_off0000e1f2.bin
a97378d906d40034cec3f9da01af1e4fd5359f689c19a51109b4d2825169c160		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F2 10404 bytes
font_01_sfnt_off0000f98a.bin
6e23ce7592e59017581a79b48f393f2ccc1dc264cfecbe5aa3eb14c8b30c111e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF98A 19644 bytes
font_02_sfnt_off00012bea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEA 16792 bytes

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