Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ce208019925fac9…

MALICIOUS

PDF

77.5 KB Created: 2021-09-17 04:35:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 16e76a11cf11954299045ed50b7a0419 SHA-1: e2601efe1bda77fd8ae37e4f8c326e89f17b66a3 SHA-256: 0ce208019925fac96194a63abc15fe497c39eb2644eea7d37e4e3f88ac1281fe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cristal-in.fr/userfiles/file/8307929395.pdf In PDF document text
    • https://evpersoneli.net/ev-personeli/file/22452120777.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/vudagukejezinuguke.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/92199838792.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/eac8454130dbe52b16f72c337fabbce9/dogazifigudirobepuvu.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/36794489993.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/55377491387.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/wunukidutaxevimitagol.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210914173547.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/81986298108.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/wogitanepaxonolenotib.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/88727188604.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/66531589580.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/69988641471.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/towurepizomidanupuvege.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/77136425539.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210905070604.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/lamudexunewujetikug.pdfIn PDF document text
    • https://urology-andrology.com/userfiles/file/99926778610.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/jazoxagibubalajoluwi.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210907_215749.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142658da3dfc---lagaxiki.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210901223224.pdfIn PDF document text
    • https://latework.cz/soubory/50848977843.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e2a499d50---donotopadofinisufanexukov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=play+music+android+tvPDF 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_off0000cda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BE 10680 bytes
SHA-256: 5a66e2b3436666721f5b621a0acad07cb2932e29845f2e4e22f16ab341d094c5
font_02_sfnt_off0000fe42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE42 16396 bytes
SHA-256: 994da92056f1204e94df14af1bf9ddbe8585519ce292b46b2a35e15cb7189669

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