Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9878415b0e4b82b…

MALICIOUS

PDF

72.0 KB Created: 2021-09-06 21:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 400edbc5384f87c6b4f7b7f836d1d1d1 SHA-1: 0bd46446b434ab418a6090ce9eb09e33e5fd2272 SHA-256: a9878415b0e4b82bfe9b93b1662697dafcc209fb37d182439a9ba2df9fe6d69f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the heuristic firings and URL patterns are consistent with a phishing campaign that leverages external resources to deliver its payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://drafthe.ru/uplcv?utm_term=cells+and+tissues+the+generalized+cell+worksheet PDF link annotation
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/25816fc5d128c8f37de2280ede1a8b36/pixex.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/nizorubasugen.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/e2046e49d28e6ad6c49d59056b863940/zunamobabuso.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/sonodivivumatijow.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/vatokovijebuwazewobuw.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609299d8d9c4f---lukozudolulizitetera.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/niximi.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608458ef4bc88---mufisijafozoja.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c1040615423---74833680406.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/daronudobobuvumamaran.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/mafodaditafabipiwiwepigo.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/bivipezuxonadax.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/22385276636.pdfIn PDF document text
    • https://rails-bg.com/fckeditorfiles/file/vakufoboxajonumifub.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/nelexogejebawobobum.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/a0s64jveg7704itgshpjgosat8/13352002620.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/ac1a0de27cb7e22f432dc89a00123b65/82889008885.pdfIn PDF document text
    • http://escqatar.com/uploads/userfiles/file/file/zupaluzibodewisavejej.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/428370df4018045e24be83b9bf41dc19/nawokedurevegamekixatuso.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40262258877.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/62140850032.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ad1d63c65---takenapama.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/56975623242.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/57dd897976b83566fe53eec1c3b7cf66/lasel.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_off0000bb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB52 11020 bytes
SHA-256: 5832460c9ccb5d879ea2fcd54ad5f1d09ac8af08c9d4d6fe3e63167c469438e4
font_01_sfnt_off0000d4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CC 14828 bytes
SHA-256: 55158a6d0010aea59b54be98353274bd4d5748bb8faf5002a6db620deb6974bd
font_02_sfnt_off0000f99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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