Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f790f3cbed2d3cf…

MALICIOUS

PDF

87.3 KB Created: 2021-07-04 13:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d8ccbe2abf8c671d03ccde9c8894e816 SHA-1: 429a4d7f1a5192159435cd98880cf16168be393e SHA-256: 5f790f3cbed2d3cfc8fb5c6df7063f8ce3dcfc853d1ed86fd91e93e95d3f3598
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS upload directories and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links implies an attempt to redirect users to malicious content.

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://synerhu.ru/uplcv?utm_term=earth+quotes+images PDF link annotation
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/02172a4cbb6bba83190dfae9f138f951/risuguf.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/rutexo.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/a61d158614b81892e5e779e4fcbb2836/rosotabuj.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/11b0a78ece3a8c8541d7b18ccbd99066/26029270876.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/eofkk6sa27ajj0gurbqat8uarq/vamipidopenate.pdfIn PDF document text
    • http://plncse.hu/php_data/file/60929858928.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/11608637565.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/suwevofufajimizusetojevo.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/acf0929fcc1d6247627698781371a4e4/85153856640.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/79935393645.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdd8a29ca9---kuliteneziduxu.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/9lt0uakuvghsjc6bg1q6o7h1o5/76152227320.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2e95add1a6---vufase.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/zasakotaxomukijite.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/31v6qcmkrpa8th3q00qtburoq5/javidilajizozi.pdfIn PDF document text
    • http://bjeclinic.com/ckfinder/userfiles/files/10844388803.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096961b0c4e7---zunuz.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bba9a84dab7---zidalizud.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f81a40cb2---11912557795.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/82a3136b7c529e145226c206b96d8ac8/58692807795.pdfIn PDF document text
    • http://smithandfriendsfamilyreunion.com/clients/d/d0/d05d9bb0b75700e7199fc64e52c62161/File/96684414530.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/d3dac06080cf0dbddb4306e5a6276c9e/wudovokedov.pdfIn PDF document text
    • http://alkimosgb.com/userfiles/files/zomarilopisepukor.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/b82faf14de379ccdab5072ad81d6f2b0/laseweripaxuxelagegiw.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_off0000f37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37B 10632 bytes
SHA-256: 9cf129cf13b5401a55dec585a160cc80a9d79e733516d6d8d61d1b20a67d7263
font_01_sfnt_off00010b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B85 17204 bytes
SHA-256: a351751ce39a3179fd30899579551de8b01e9d07ceb01d9a2c178bc674b8d96d
font_02_sfnt_off0001382d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1382D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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