Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bad0bce452c7082…

MALICIOUS

PDF

88.2 KB Created: 2021-06-28 12:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1fffaa0685e34a376899fbfb5f3f86e8 SHA-1: 1ec17ca237d269841c7b7c1801436db8ecbd35e1 SHA-256: 8bad0bce452c708251b5e7a2b29d5e1b6d65bc89b0fb8d993b4b09a413cfb0e3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to compromised WordPress sites, functioning as a link farm to direct users to phishing content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the final destination through multiple redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crewmak.ru/uplcv?utm_term=ucsd+library+study+rooms PDF link annotation
    • https://rumputhijau.com/contents//files/suguxodijitoxijumitobob.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b873fb52ea64605b919bbb84ea005ee2/71326907180.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/83202576476.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/72860431097.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bdecf70f5b2---zolafijefolabe.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabc86de8af---10506634341.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf822c7437---gofizowexigoxo.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/mnebvee7qftp9sk57smttesl0s/45159415826.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/suh6ftgjfoq0b1jvucrj0f6rp6/19783064877.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1dff42a51---lugurejovoxoximefu.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b91b3877089---96465858574.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/gixosoxojimatubitujugi.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/xejanurusosa.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/6e898f6b3ff3e147cf2a01c10bde7560/xibaxamugezatibupemugelat.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/16835353651.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16078156b2df80---60827885137.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/lovediwuxarisatumigepi.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4ba030c08f4c2c4a8294b2631f58566d/mojosumagobofufakod.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/rorijefuvelapuxobepitus.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/29616755060.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/nagubarumub.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/kojesaviki.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_off0000f66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E80 17092 bytes
SHA-256: 2a4c2dfcf67cb05613d6f5a87c5167ba60b8a2d4a93fcefb4835885d30a9536c
font_02_sfnt_off00013b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B6F 10656 bytes
SHA-256: ba5f6a3307ac00a30d8631b2d34a0686266ef2f71450cf32343da2432dfabbf6

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