Malicious PDF — malware analysis report

Static analysis result for SHA-256 5580a538071dd9c0…

MALICIOUS

PDF

74.8 KB Created: 2021-09-18 01:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 05b006f8fea4ae26864f6d739407f5b4 SHA-1: 4e9cb8bf05353e034b6bca6770174cf878a13383 SHA-256: 5580a538071dd9c0ffaa57f537e89dec1295691e8efc999dd64e7d2f8224cecd
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The file's structure and numerous links indicate a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://wastran.ru/uplcv?utm_term=hacked+talking+tom
    • https://podiummagazinenews.com/ckfinder/userfiles/files/mibinixoz.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/418e9a8cc0fab53789788870e25f6705/36798420581.pdf
    • http://www.tamilsaga.com/ckfinder/userfiles/files/xesoxizidedulamex.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/67634432284.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140531dc8df7---10846458068.pdf
    • http://mcenterdk.ru/fck_editor_files/files/32478422174.pdf
    • http://fotosvatba.net/userfiles/file/batukabunox.pdf
    • http://emailreceptionist.net/userfiles/file/12285378078.pdf
    • https://geneolock.com/locktactyuma/userfiles/file/kakaxufepa.pdf
    • http://pieseclimaauto.com/files/file/xadalizud.pdf
    • http://2m-m.eu/userfiles/files/72215127629.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613012142dfed---pafepoxerekujeweki.pdf
    • http://musiclivemarsala.com/userfiles/files/59874302957.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8a09ad844---67985605892.pdf
    • https://kominove-centrum.cz/media/files/file/37235919637.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304b43c8cfe---kukedatemenowale.pdf
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/rasalaxedujefatidasej.pdf
    • http://abwingsbuffalo.com/uploads/files/zebejutinuwamovunazovuka.pdf
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/rajivusoni.pdf
    • http://suarezbeltran.com/aym_images/files/putopilolaja.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5a475d211f0acf968a333b2352a842c5/xojut.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_off0000c198.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC198 16792 bytes
font_01_sfnt_off0000d9aa.bin
46b7e55e8d9013a0468c08c80d8fe29edd291a648e2e5f122e1282986ebe6855		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AA 17332 bytes
font_02_sfnt_off00010632.bin
510b17132d07655cecd95aabee70e93b0816f4e9b720f8e2387dcc01cd0014b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10632 10528 bytes

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