Malicious PDF — malware analysis report

Static analysis result for SHA-256 b47fbd561d4858d5…

MALICIOUS

PDF

88.4 KB Created: 2021-06-27 15:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13952e6c0ac7a17487e4003482c6a683 SHA-1: 9f6eba61dd5e8a5b577a0ab4bd5190a1bb613751 SHA-256: b47fbd561d4858d5a4519cb711b6b8ee5dc7f62da7f09d5fbb2612c7006f7afd
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious content or redirect users to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. No scripts were extracted, but the structure suggests it's designed to exploit user interaction with the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/0214f3165ab161caa55df61a2fe17b40/bexajozowerejowa.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/0fcf003985874721af4945888205f2bb/28827269577.pdf
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/sitijes.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/c1929246a1117144ce6ac1e71f59e12e/zudamovixanula.pdf
    • https://jdlpartnerss.com/userfiles/file/losudojapigonujanelirib.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/knkd9qjl82f3061tg8k1rh2mpm/43254328391.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce93521f6ff---dikivalogaladodere.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/c7f17c3443b9e77dacbe2d5f67292cbb/94513541130.pdf
    • http://hytechplus.com/userfiles/file/nafujisenasoxugasefeso.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d694c7367---zenalo.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608264550ccc7---tonikunojut.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083621d9ba43---73212297234.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2ec13ff5a---rowasidunegudiwitaxevozi.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/33b665b56a9bce86f9ebb3fb5759add1/jazinososozavifet.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160889959d0bd6---80603412856.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/o2ki7dc5khccmmt2rpu3f4kjr1/2284658174.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/4cd942dbbd3706945b76fcfed3c43a01/3791487364.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607459ba8f9fa---88004913556.pdf
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/zedinagevavigo.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/67a3cdff89bbfcd9909220f33ecd3a10/57381607963.pdf
    • https://dienlanhbachkhoa.info/upload/files/sesamujiriludaponibepeme.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/vh8doj7rrpo78bukhf9fb901t4/dapuridagepupoxaz.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/c03c3fa005af7f2073f8824f4010a0b6/gibibulumalajurex.pdf
    • http://sacoorhealth.pt/site/upload/file/votume.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=what+has+riddles+and+answers
    • 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_off0000f8c9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C9 16792 bytes
font_01_sfnt_off000110e0.bin
790722cefad8c8e28cdd9fee400f7a6135a1845171976a4b979ba8517fac9b8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110E0 10304 bytes
font_02_sfnt_off0001280a.bin
19233e779f62230507e454e34d5662625f92fc6725cc6d9747ed46dee99d8657		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1280A 17108 bytes

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