Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f67f2c5a854bb24…

MALICIOUS

PDF

83.5 KB Created: 2021-08-12 15:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3678bf3b5b90058fb9e81fc960b6b4c4 SHA-1: c8ee3bcdc7cb4270d55fd292e62a6b53eff67a9d SHA-256: 6f67f2c5a854bb24ae7c6f96b4f3c26b2d33ece1c3579ee5961b097335acc525
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to obscure the true destination. The presence of external URIs and a link farm indicates an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://renault-service.com/userfiles/lomatiwuvidira.pdf In PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/63671238332.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/mnl3j89o1nti1daamajtgsp5iq/11041041461.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/zugajivebenunorevoju.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/b533fedf0364422ceb28576aadd00f9d/56551566280.pdfIn PDF document text
    • http://hochrainer-elsner.at/upload/files/55592410338.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/lv8akln2muptomcu8rjd2kdahv/29420264980.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/285efa533cc32605836727c49230618c/wetimaxo.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/gf4qpjvf51v8osdko6on4vavca/71955620275.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/429cb555576b9587b96d56eecbe139ca/puxizolimozesulufuke.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/wavanuloxexu.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609412cbbd039---vaxadomipukuk.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/mapuz.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/vimaribiposowav.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/40nimcnbf7ksh76boactjdnjg0/xudotape.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/600dd49cd74f25b0ba3f5c513216d927/89798737827.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/19096366606.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774ae2a3da1---31807945251.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/s2o20169upqqe8lvtnmbfhnus0/77780089358.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/lagexujeri.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/d8697039633574f93c99f7e27fc1dd99/bixubikusamuzivido.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b75d0c533aa---ruvikovul.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16102d07dbe3a6---dekoregeziraxevovimij.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/rabenuv.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/9211dcb3b2a7a972cf13e7e2d62ca783/19348417673.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=limited+pets+lawn+mowing+simulator+codes+2020PDF 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_off0000e0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A5 11240 bytes
SHA-256: 4eafc5c9229941d29b528a28b7bfd5d1cdff65f9a245f925ee36794e26aabc57
font_01_sfnt_off0000fada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADA 16944 bytes
SHA-256: 0f9c2d2d42fc67cccd594056bc5285ea2c6e8e0a5dba99e792c91d9f20ddc35b
font_02_sfnt_off00012747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12747 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1