Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4dc0eab71ccb6a2…

MALICIOUS

PDF

75.3 KB Created: 2021-09-24 22:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7f1b25791aac7ff1bde584f7fd9e4224 SHA-1: 36c068ad9d303c61cc5dc495db028e64a9cee7b2 SHA-256: a4dc0eab71ccb6a29316db4f86ec2aab086dbbe46315576bec3bda465a0206a7
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to phishing sites or download further malware. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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=song+of+war+full+movie PDF link annotation
    • https://rsvforum.com/userfiles/file/86549269942.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/28677966580.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8531034d0888da2bb9386306ad4f46f0/sananofuruborumodudow.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/a9d6fd06ab119dc459f2aa25fcc153fb/40513309893.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/56223189418.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145c89bb462d---gakimigo.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/tupatowojuko.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/92566722059.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b08488ebbf---kipuvametol.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613b18c393c3a---fodigaga.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/monavekizofo.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/72414411215.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/88956197598.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/nupid.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/72189761433.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/sukiwisilumafuvexexena.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/13519996816.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210905_A2443C91B533914E.pdfIn PDF document text
    • http://signauction.net/userfiles/file/togolirepakosuzaximepe.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/noniga.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/dipiwitiwugogumokira.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/76885423909.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/masutenasixusijadiduwusi.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/84032709806.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_off0000bd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD20 10620 bytes
SHA-256: 26ca94c6b2188788d7745a4027d05c83502a4459d939dfb20a6a2d7b781bc8ab
font_01_sfnt_off0000d57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57F 19752 bytes
SHA-256: 43c7195b8ad3bcc916edac5cb34b1fd22ddeeee916f9a1cb6ef772ea3265bdca
font_02_sfnt_off000107c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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