Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fd4a75a31004ff5…

MALICIOUS

PDF

94.6 KB Created: 2021-07-06 21:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 738ce24ac7c91487251e09631160a9be SHA-1: 53ab61f2f21a6f1673aa13dfc7fbf95b75df41e7 SHA-256: 3fd4a75a31004ff55a4c12c8af6aaaa0da3c8e02057852391eabff22bc3dbf4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external URIs and links to compromised WordPress upload storage, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of embedded JavaScript, though not explicitly detailed, is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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=call+of+cthulhu+7th+edition+pdf+free PDF link annotation
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/6fd53f338f08b4c7ebc53d6dd9ddb807/35236887975.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864ae9af93d---19335725733.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/fagitoz.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/ladolaxozibusukoxomataro.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/mumabimare.pdfIn PDF document text
    • https://qualitymattressfactory.com/admin/userfiles/file/79250342501.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf226643d87---sobakigefi.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d39e50c19e3---pasedemutejabareda.pdfIn PDF document text
    • http://1975geegees.com/clients/78603/File/24962293744.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/ee9e81fa8ce650b01e8082b2ed010dc4/kexemusuv.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c474424217f---73829319345.pdfIn PDF document text
    • https://scriptdd.com/_file/file/60983259239.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/a5bcbda9dc6c18730bff0a5406e1f1cd/duvutidufatepa.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc166d5577---8704619646.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/18755231363.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c182e1df7aa---magizare.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3c75b8efc---wipisowesudarod.pdfIn PDF document text
    • https://kristinanamaste.eu/files/83045300279.pdfIn PDF document text
    • http://forresterfamilyreunion.com/clients/c/cc/cc72bfd2512333311cc1ef5a4fdef90f/File/4043690870.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/gifopejevuboxaxogin.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/nubi33tdn61kslk9279t5t4q26/jatiwotebulavag.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_off00010d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12550 10732 bytes
SHA-256: 87ae1eaba38df6a725ba2e6e269e3c7596cb191bae90646e10589973f990dcca
font_02_sfnt_off00013dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DEA 18220 bytes
SHA-256: a5981fe474126aa5d00dfada606e3d64cb6501fce07464f8c3d51e9df8081fd7

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