Malicious PDF — malware analysis report

Static analysis result for SHA-256 328cc56dea30d310…

MALICIOUS

PDF

88.8 KB Created: 2021-06-29 20:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1a7a306121672cc4ca3955dedcb4ddb2 SHA-1: 83f67f198080031b21f41c4afbdbc54a07d908db SHA-256: 328cc56dea30d3100b6f2e02c386cc8398c4b45a95701edf5f3160acbf35b322
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The file contains a link farm pointing to numerous distinct hosts, many of which are hosted on compromised CMS upload storage, suggesting an attempt to distribute malicious content or conduct phishing. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/7ob14fhnh20hn1bh92d60jk26c/90978998454.pdf In PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609655238bce5---semikibigapasev.pdfIn PDF document text
    • http://etre-belle.su/images/file/lakizomesuvaledudokilumun.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/6728392850.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a34b9a7d32---xigosidisajetojukopubuj.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/4dca75501d0e839da194cf1aa3c1ea72/zilezodesivebunofatavi.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/9797100520.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/lowusuro.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d98f8d14b---zinosute.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a77c1ce0aca---bisexeri.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac859b4bd35---62567236078.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a86ccc8cd8---31766757248.pdfIn PDF document text
    • http://dietmoitangoc68.com/upload/files/59170992529.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704fd82ebb5---37728521808.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be465bd3128---kisamifolek.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a325572aa8d---30621554837.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2dbc99df3f---suxozumegebobilodawoseti.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/39de81bd6351e54edb08f209cdd9d122/tipawokitiroreru.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/91f153d44f95b5235bab1e3a0500541b/tidurezuvasofiragif.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/ef5182bc30c2657d099e35ba61847e46/popubilafugudebepaj.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/46591403448.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/url670o1b72ju2tr4jdf19vke1/turoxevoba.pdfIn PDF document text
    • https://khanikango.in/file/43613747539.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/givibufaralaribajab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=for+example+punctuationPDF link annotation
    • 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
stream_002_off0000f729.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF729 18172 bytes
SHA-256: 2b092061e2c35b4bd329a4df4d24f89938cf2dece9996da5699023a099a4c2bc
font_01_sfnt_off00012726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12726 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F3D 10548 bytes
SHA-256: 153d187dfe54eeaab95746e375acfebe8d8789a497fcb40a62be24bab936ad8e

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