Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0d31031fafbe2fc…

MALICIOUS

PDF

79.9 KB Created: 2021-10-06 09:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: df61ff681bdb92f25bf69f633780bd86 SHA-1: db314740b1e4cee68d3315bf71f9f17e22455dc8 SHA-256: c0d31031fafbe2fc6ac1f6fe56b7bc4d0b3fbc36cd65581c2810330376fe076e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting sites. The primary purpose appears to be directing users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://parfumerieindex.nl/images/uploads/sobosumosifa.pdf In PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/415653ad738bd301c84dd46a5aefa8a6/domiloxifadifiwavefekame.pdfIn PDF document text
    • https://venus-forever.com/image/files/32401900312.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/vimuxeludalufi.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/remogupusasagev.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/88007150890.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/63263123044.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/54uak32uoul516vvtiudnlsvi6/wubiv.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/masopejekogimidok.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16136b41e7cdcb---23718779694.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/4eb6e8128f827c73c2328ae5f7fa9c90/kaburalupamofit.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/timumunabimuvidoxapiw.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/rujedaxuxobipofik.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/fozopegilagijum.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365bc4ccffd.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/mojaxupozozuko.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/taparitujotexotidupivut.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/75216469076.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/34021000094.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/kazesuvavamojaxexobobutes.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/89822473097.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/7e9515a622d7239f3d5e15f48c2881fb/12541373865.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/jitefunefusu.pdfIn PDF document text
    • http://cichanski.com/Upload/file/14481006441.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=periodic+table+template+blankPDF 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_off0000d209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD209 10740 bytes
SHA-256: 7f264d56404fc76596b0964cba6460803d056c6bfb21149d839364ec1432ee07
font_01_sfnt_off0000ea6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10281 18772 bytes
SHA-256: d723b3779e9ddf42ccbdf3a218acec1a3ee66a9c486bdc53703085065796c2b6