Malicious PDF — malware analysis report

Static analysis result for SHA-256 3965b6f8a68531ef…

MALICIOUS

PDF

88.3 KB Created: 2021-09-01 21:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ae30ef21facbd049f8e4845ad937ab51 SHA-1: afec2c53e2b81d46adce5021680fc946b94f8037 SHA-256: 3965b6f8a68531efd00303dd1beebe3600686ec0d5d24c3f048caf5b6d616f8a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be directing users to these external URLs, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c377298b73---97163232930.pdf In PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/be41ff5b32aaaf1830b604a151f16bbf/72753520133.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/28701122916.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/soduzifof.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/e6c0ad57b37bb4acbbcb794fd5bd32d7/4144041078.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/29223800051.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/bitosuludurel.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/jipimipukejagoku.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/bacu5etr3mrhqr25tdqoq1h3f7/vonaxexolegusewegu.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e1021341da5---28664886699.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/6kjrd6b1tcjg58hrv6v2v87hmg/2141369396.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210828_010216.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021082918042179.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/renapu.pdfIn PDF document text
    • https://magatek.com/documents/file/dumivolos.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/rufemitirurotuduzemavod.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/jemevufefaj.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/vanetufisefuwave.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/sepidibasad.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/dufer.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/rugilo.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16085fb3e619ab---daragesejaj.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/dubotefipewugixutat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=cassidy+rae+nowPDF link annotation
    • 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_off0000f4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AA 18188 bytes
SHA-256: d4ba6378916bf6e3bcf7d9ca2a50c8e0432d07be983ca87535766225226fcb80
font_01_sfnt_off0001237b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237B 10328 bytes
SHA-256: bd28b6078ac3f970327f24a30639e6530b3aba60320da87b798eb9a837bea2e4
font_02_sfnt_off00013af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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