Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6fe1027d6361127…

MALICIOUS

PDF

78.9 KB Created: 2021-09-05 16:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 985aafd32a6996b599973a77e07dc7c4 SHA-1: 3fabdb7dd105432c7973ec09f32af5d21f9c2005 SHA-256: b6fe1027d63611279308de3626c7373fddd5d138e27463e50090911dfdccdc4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous external URLs embedded within the document, many pointing to compromised CMS upload directories or disposable hosting, suggest a phishing or malware distribution scheme. The file's structure and content indicate it is likely part of a spearphishing campaign, aiming to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://ketchas.ru/uplcv?utm_term=free+online+convert+scanned+pdf+to+text PDF link annotation
    • https://vibangnhadat.com/uploads/files/bezogogasonufexolakifured.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076167db1fc4---1028653398.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16100d7e06afda---zotezigoxajupula.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/wexakedezumokefem.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/kedaduridakawizevepiporet.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/bepegetisezosupipul.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/25871214018.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d46bd02576d---81992088629.pdfIn PDF document text
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/54462710373.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/cd58353405b081b56808fec86227ad4f/35919382654.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/26435566526.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/daxifirimopo.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/b74c46a078e3ec7e5d9dec660571bc5a/36744279917.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/kisitutabupafef.pdfIn PDF document text
    • http://naucseto.cz/storage/28238557821.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/mamulupirisososuwogigivuj.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/zamud.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/5190d9d9132cf926770dfa76178484b6/wufomonegel.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/vezuzuwameboko.pdfIn PDF document text
    • http://limitlessillusion.com/wp-content/plugins/super-forms/uploads/php/files/fedbbfbfae0f57df4b74762a809e8df8/tofifezopisakutabek.pdfIn PDF document text
    • http://whatdwellswithin.com/file/xomegiwanu.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/70540283210.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_off0000d17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17D 10760 bytes
SHA-256: 7716d52c2c94083dea1b3b356983768602ac9f31914d61f79f24cce5e2eae73d
font_01_sfnt_off0000ea57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA57 16848 bytes
SHA-256: d9dfa36f4aadc1b887faa7c758def0a99192673f16b1e6852c718f816f20cc4e
font_02_sfnt_off000115f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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