Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6eef6126bc1b6cc…

MALICIOUS

PDF

76.6 KB Created: 2021-09-13 11:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3bbcb9c1033090dee2a3d5d14f5f1538 SHA-1: 6114df23bc851cf54b63a41fe03d3ac08760fe4d SHA-256: b6eef6126bc1b6ccaff71d2812965f0163d2f46a79e5644c1a767b336f857c18
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://catamma.ru/uplcv?utm_term=android+see+password+wifi PDF link annotation
    • http://hrudolf.com/userfiles/bibesotazeg.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/37515059939.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/15056360824.pdfIn PDF document text
    • http://martonelektro.hu/files/file/bafalew.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/40595836617.pdfIn PDF document text
    • http://budropol.de/Upload/file/71291336686.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/bemapaduvojutinaka.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/buruku.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/19171748916.pdfIn PDF document text
    • https://graphicart.ro/fckfiles/file/tidivefofadowozolesif.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/vokezabebubawuzulenipur.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/tarenixefipi.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/18647679398.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/718599c5ef0c273dd95e9058f2f39153/nijidosajodik.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/retaliwisiki.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2814d3194---sisufikepisime.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/godurorunu.pdfIn PDF document text
    • http://tulga.ru/editor/files/88633782795.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edd70a99ca---19454325181.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/zuviguwugefoloruxi.pdfIn PDF document text
    • https://tch.lu/files/files/405238983.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/27684535391.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/fijatitije.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_off0000c6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ded2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED2 10416 bytes
SHA-256: a792deda6bc0bb61774d7ff830bd05b3cfe8c3c3e1abcea4ad74a16cb4ef6ec9
font_02_sfnt_off0000f694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF694 17816 bytes
SHA-256: 590e31610b115230b4b757b46b282abdd2256b46f501284bc9b9920cdd3fa745

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