Malicious PDF — malware analysis report

Static analysis result for SHA-256 d25351391dbc6ef6…

MALICIOUS

PDF

82.8 KB Created: 2021-07-05 07:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0ebbd325661f640b3180eaa753260cd9 SHA-1: 2b4c5bb193f78500a22142acf23a6e2d26c5ebf4 SHA-256: d25351391dbc6ef63bbab393ef5b1b19b5d6e514b09d4e8642244178a939e944
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress upload directories, suggesting it's part of a phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chauphongasia.com/wp-content/plugins/super-forms/uploads/php/files/fbhjre7e8b4ourps0tvvvcmkv1/boginigude.pdf In PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/c12c94f4af9dd743a1bccd00d4b51a50/walaxomanikowitumevisanef.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/f10ae0b5b6a6ea2a9ceb87a29bce213e/64125790916.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/c7aaeabbfff100727bd45cb9e429d9a9/vaduse.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/8fd08a784b115387cfd234c40ce0dd26/tudawogogogizepezape.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/05i3sf19hlc4bv7g5vdep6e5l0/98436755272.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/97f6qode0tqmup5p158kdlea83/feribudaletafedupolajaj.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/cfac8f6a5d3825e5c39bfb54ad3f8a14/bowuwalulomuvuxazesuzoru.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/3001fa68a33525d838cb25aa288d1429/zuzolugonoxegasuvibotip.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/11101142630.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/e14e2703e1564b7ee7712cb5771eb70d/zebajatapegogonovafilubuz.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/kidobopopovovetofezaxavi.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/08b4de07b897e986e2a4b29ceeae1862/nifoxoj.pdfIn PDF document text
    • http://krikrik.ru/uploads/ckfinder/files/rakefagalu.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082e8f18d7dd---28110763487.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/95880436073.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/sol0nltskpajktdo9n9q0m7ps1/wupalonavuzugebumugikape.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607c657706ad5---58412211504.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/zudolifadenezodob.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/pibegamuvosajikifuwoxuwut.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/biniferanoredek.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/5672369243.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16096f4a8d46de---bexobulubitaxaramovefo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=logic+and+computer+design+fundamentals+5th+solution+pdfPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/91ba53d424e39668c07d14c2263db12c/dejituzo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9D 17232 bytes
SHA-256: 79defdb47e5f25db2da82c00df106b900498a5d495de7a02a16840478a9e1e46
font_01_sfnt_off00010b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B26 11256 bytes
SHA-256: 84b406628b4f72458292170998b8d52c41e80e88a1ac82d089bcc44a4daf1e5b
font_02_sfnt_off00012534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12534 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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