Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b8f2a05de9ce39e…

MALICIOUS

PDF

82.8 KB Created: 2021-09-03 00:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f812eca7a3c745d8257553f1cba65e8e SHA-1: ca0b261abb42264d999dd014cf73d4590870f9b0 SHA-256: 6b8f2a05de9ce39e2fd9ca47cd0f754f74cc77411bc4980f976254a60c425f6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS upload storage. The presence of external URIs and link farm characteristics suggests an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://gallery4walls.com/upload/editer/file/81302103622.pdf In PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/xozatawurorexo.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/135beb8d8b92c9069430e995ed5bef1c/xaxukazemotik.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/10805265692.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/67597334689.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/99398825311.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/52379948914.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/66460036904.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/64630044183.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/95031654451.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/19112129428.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/musolenobalonisudinunon.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/37657162169.pdfIn PDF document text
    • http://ruresept.ru/files/file/kabamifatiwosaxosuwas.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/39454416887.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/dasemixu.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e0fb45660---38752673616.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/e7b3dc39ef9663070dc70cf08c2ae4db/junetewanidotit.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/sejeguzukodefimud.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611e25d25f3f5---79345740285.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/29951138567.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/uvk155ukffdoqdc1ciigcij1p5/xizoma.pdfIn PDF document text
    • http://quadocdao.vn/uploads/files/6959954927.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084159c0c58d---zelir.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/pogeloforewepubewetelabar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=tietz+textbook+of+clinical+chemistry+pdf+free+downloadPDF 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_off0000dde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE5 11444 bytes
SHA-256: 58bf6a03bd6be34642a34bbb3353ccffcc77c164f9fa35ff1dec44f9cb7bab3b
font_01_sfnt_off0000f8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B7 17380 bytes
SHA-256: 68a2fb6b61af83e35632e8c0ad5e3f14f0098936e7e850493b8edbd1bb29cfe7

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