Malicious PDF — malware analysis report

Static analysis result for SHA-256 d48b402f609cbd15…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 22:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dd866bedf49d212bad4fabba78162002 SHA-1: 80961ae25e208e6072172caf108440c448a43d90 SHA-256: d48b402f609cbd15dddd57de87ee5c90f6523f6f4b46d6be4eb688d932c96ade
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. The embedded URLs suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://laborke.ru/uplcv?utm_term=mansion+bloxburg+houses PDF link annotation
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/bfamu32ns845rgv2j6avefh51f/nidabonerusedivij.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16141abb8ba84a---40821741022.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/webap.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/kapem.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/75554997201.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/62320496001.pdfIn PDF document text
    • https://superchills.com/userfiles/file/93191971838.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300e6f83cc3---63614541164.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-2/20210902010901645153.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/soxobefivotaworapitaremu.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/gexasenofefazenub.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/69421276015.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/43721996315.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/b49ea431946105345e6bd6aa886f54c3/55990423490.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/nideso.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/nagokiresenalixar.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/komuxuboxegufuwiloj.pdfIn PDF document text
    • http://movediary.com/userfiles/file/kemotogofuronuduxudotibow.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f87636f496---24873042481.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/34518514101.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/47834686749.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_off0000dbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF3 16544 bytes
SHA-256: cf37f4c03274a0cf35fa4763be597e95ec72f9ff9acb0277827a9572b3073eff
font_01_sfnt_off0001069f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069F 10624 bytes
SHA-256: c9f75753e8179fe8a1121ee06da26c623ae8e38438c6fce3a8cee845c2981f8f
font_02_sfnt_off00011edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1