Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c51341ccde4ba88…

MALICIOUS

PDF

73.8 KB Created: 2021-05-30 15:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 439044e041552d74fe7f8d5724b4462c SHA-1: 953da1ac2b18009a52f5b88d768a4535c01617f4 SHA-256: 3c51341ccde4ba88511a0285f243e1fc90bd7eb387fed4e0c36aba35236c62ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. The embedded URLs and the nature of the heuristics strongly suggest an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://queure.ru/uplcv?utm_term=nd+daycare+assistance+guidelines
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/6rfp5dnl14v0m6515q0pp1u57r/fosiwafimobod.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/d24c56101c37c5f0524d86c1193ae4ac/xowujitulesizadugajedo.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/080738e7ea8a43c78c8bd8d5c8214df6/43454964281.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160904af5d2e2d---81881319504.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/c30f99a41c01e25b57f8f7daedb8c70f/56330487328.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071047d7b459---15052651377.pdf
    • https://lapalettedesarts.fr/gestion/file/85582217811.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/640e05a9486801fbca46a78d732e6b2f/sitosuxipumewurenu.pdf
    • http://nesthomes.in/userfiles/file/bezefawopasimofarim.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc9678363c---69918869646.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160796facd17db---funetobugipi.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3048446c09---14809912718.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eebc6c1425---82909565131.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073090b43740---gelojasu.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076dea3ab33a---vurofafewi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4ab.bin
e8c74ae9815d51ddb8463e159ab870399dd36c0fdfb4aef72a9a1b8effdcc27f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AB 5180 bytes
font_01_sfnt_off0000f664.bin
6ed11dff66ffd4a547b71483133084cfc6a7c611f0c36d841a24d992b5fb3c4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF664 10360 bytes

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