Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a741e87c2f3def…

MALICIOUS

PDF

73.0 KB Created: 2021-09-04 20:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 377fbf5513e546ae8b9f500acd857d6a SHA-1: 7eed43b6bc778268e56db12da56d737eb139d322 SHA-256: f3a741e87c2f3defaa18e892b3653892d6bfe2473e334986942679975eeb1de6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable hosting sites. These links are likely intended to redirect users to phishing pages or download further malicious content, aligning with the 'Spearphishing Attachment' and 'Exploitation for Client Execution' MITRE ATT&CK techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ketchas.ru/uplcv?utm_term=indefinite+integral+with+initial+condition+worksheet PDF link annotation
    • https://siroyensao.com/upload/files/papofamunipomela.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/4128f1ebebf0c639e9a3de5652cf768c/24703421601.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/84235698302.pdfIn PDF document text
    • https://yepsell.com/userfiles/files/11918413802.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16079c7ae72291---mexibosokub.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/74983216875.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/89e4b42c5420bacf69d4214e6b5927c0/manenegesopiromazex.pdfIn PDF document text
    • http://hnspkjx.com/d/files/80906522776.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/tewumaloxoxegasi.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/a1f2f5e110c70326d4434cdcc0d08fed/12903614674.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/bec7999abe3d5c732790c7cb525225d6/70076049983.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609556d376d02---jutevudela.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/95955091458.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/worabojaduve.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/57699459502.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/89130504797.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/96573444974.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/verupogekujusol.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a4db2e69fd1---89392935442.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/d88b715d879136d69424e9fb6bf8ccc5/tiralafuzifu.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/dovumijiwijudazomeva.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/40970738298.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/9fb6d2a4a5ce8e0813108ecf99d4cade/zavowa.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/15528197207.pdfIn PDF document text
    • https://nhuadailoan.vn/upload/userfiles/files/rovijakipuzobomuvedor.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_off0000b975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB975 10884 bytes
SHA-256: 4c4e7867e97e5f700463a8672e6b08f971e2653842e18f0ca7efccf456ef7654
font_01_sfnt_off0000d26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26C 17004 bytes
SHA-256: 5c61adb2eca28a9cc6401101780d00a4a57bdca35ef7de8576739c6306150e39
font_02_sfnt_off0000fe0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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