Malicious PDF — malware analysis report

Static analysis result for SHA-256 08dfc9fe59ce48e5…

MALICIOUS

PDF

78.7 KB Created: 2021-09-03 04:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c118b83c8a0a47a39a3b54af3ee2e8a8 SHA-1: 7a9f8ecb815a2baca5346077a9e7c90431f7d0ae SHA-256: 08dfc9fe59ce48e5afd0b7bce0942a996949ddd92da6d787c333085598fb4dfe
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to direct users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=using+precise+language+worksheet+4th+grade PDF link annotation
    • http://honda-vo.com/upload/file/baxomaf.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/d7fcc965bee05687f2e4c9839995190e/24911300404.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/roparago.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/jemepolovubavij.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/suzusonemimukapow.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/mnhe49fg2o20rhvclsaagcd1n2/78589034216.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/36034859255.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/72etir8prtb8fq69s1jm0nl2ll/fukodamobebolemavab.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/5ff164917504c35a557f8802679b7280/sogorakitafuwabidezividig.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/ae2ef738a1e0a791539756181b4239cf/lipozemoninowolep.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/36850243733.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/14206065117.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/sigezebojatikobubozekudaw.pdfIn PDF document text
    • https://mattress-leader.com/media/deputawizesukaj.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/o0noboprren1n4m0v45sap4bl6/vawalubilidudegexu.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/kumonepesugorus.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/lubuvesimopelenokut.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9369b7260---wojogis.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/9iil5ldo0j8n0nl5pd7h4furg4/gadof.pdfIn PDF document text
    • https://svrcontractors.com/wp-content/plugins/super-forms/uploads/php/files/c68786b962217ea0388ca90251716351/jogujuvo.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/7d1kge416trg06lk6fdedc8vj1/77429487177.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_off0000d106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD106 11156 bytes
SHA-256: 78b83d7fc92fd633e1c9d76c9b5f9caf7a4ca6c8e2e700db2ad303b221dcdc4c
font_01_sfnt_off0000eaeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEB 16476 bytes
SHA-256: 4e69055629237224644012b6fdfce3812769fdaa36a143317c1f684b9173e2bc
font_02_sfnt_off00011564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11564 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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