Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91f7ec7746b5360…

MALICIOUS

PDF

69.8 KB Created: 2021-09-12 05:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4cf5a3e9051190991d9c0ea8d22ebf0f SHA-1: 5e76b25a040925d73eba4ab6e5ca4d2837a0f119 SHA-256: d91f7ec7746b53602e1ec0bbf709f96c3350e3002ba2e64e7a745baec721f7ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely serves a harmful purpose. The document functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. This suggests an attempt to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://colakcivi.com/userfiles/file/28557419818.pdf In PDF document text
    • http://osayit.com/images/file/gazexesonesaxedavudenugov.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/27395983163.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/4071343753.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/fimilorazunuzotufoza.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021951714213714.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/gusik.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/90680378466.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/49160ee108e284f8581d21713a147d2d/97190046635.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/xorolofunonaxal.pdfIn PDF document text
    • https://moolans.com/uploads/files/xexumukad.pdfIn PDF document text
    • https://okazionche.com/files/fapokedozemolatoni.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/56521070647.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/ruvudexoti.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/4cab32a0bebd99f2a21cac2550914e91/47803453807.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/loreranaxazodobemo.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/pefofetavivele.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/78635776227.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/25655624075.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5c194a725---64951054409.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=galaxy+note+9+one+ui+3.1PDF 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_off0000aec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC5 10644 bytes
SHA-256: 52ae29209e5acb1c04c16066368e619e8a02169ecf49b6716092bb257f1c986d
font_01_sfnt_off0000c765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC765 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF77 16636 bytes
SHA-256: c9c2c8c187894c8038e175f8638a0d8253f1f0f7dfcf20eb4ccb9a58c58b64ac