Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce2349399cc67220…

MALICIOUS

PDF

76.7 KB Created: 2021-09-03 18:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aa3e67bd3356c6533b8f97cf257d6406 SHA-1: 41960cf3953ea0d93d0490b6c500fe12a1918d01 SHA-256: ce2349399cc672205861ff8b56e1bb6886860b32f401f2ed497184ab8a4133cb
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. It contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to exploit users through deceptive content, likely leading to credential harvesting or further malware infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://oniceh.ru/uplcv?utm_term=tgcf+novel+translation+pdf PDF link annotation
    • http://iphysiology.ru/upload/37790276532.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/88165468040.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f2090fdd9---69690258721.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/055a69621b214243ff00094f2b775662/toditogigomuwanomujo.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/samakolumixefapitagaxom.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4010170287---wikat.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ffeacf37235---tedinofobaravuzi.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/06b132601b330daab6d03b71c1027cfa/16295062028.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b91d33ae9---80282059837.pdfIn PDF document text
    • http://toroisg.com/public/images/files/58242510159.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/vozenuxir.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a09e7c42d6---rujibopozaxakibejuve.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6e210815---lowitoxazej.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/5414ebd2c1619a548de04c12279f0864/63276445537.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/vibotixi.pdfIn PDF document text
    • http://mebco.ru/images/file/xelajapukevi.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/66542310971.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdcfc05e71---89872154535.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/xekanotumofewo.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/b2cdfe40f50f172f563b09bb0007fd68/bowovobuxamamifupo.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/38718608987.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_off0000bfeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FD 20384 bytes
SHA-256: 3dbe17b9d87a4cfa9fd081d2ade20f71f090453a1cae62e2041cd8c3f6c43eb2
font_02_sfnt_off00010c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C67 10824 bytes
SHA-256: d64f6ef4af936b7338abb68c6d00adf9aa5d5cf58702927613fb17f3eb054504

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