Malicious PDF — malware analysis report

Static analysis result for SHA-256 55842c14042f0a7b…

MALICIOUS

PDF

68.6 KB Created: 2021-05-09 15:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7608bcd7873b2210ece32b0e7ea60d27 SHA-1: 8e0358764c2cb37c1f1084def84503193f03b821 SHA-256: 55842c14042f0a7bb21369426b97136c6658ef832dc8122bf17ead5b72fa553b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, many of which host other PDF files. This suggests a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

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://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ab18c1288---mojajuwoziw.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075120e3d09e---bopuzizekose.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/cf3807fed62d947b5cdb2c4727267ca2/jififi.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160718a49b732f---papefuporukezukap.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c0f1097fd---30127050081.pdf
    • https://al-farh-iq.com/upload/userfiles/file/zikewomarixewawuxuv.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b750dd54d---93545494698.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081985d445d2---digurazo.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb86230d99---pizafigofatipapibi.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c96966988---powiresanijuti.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/f22685dd3b993266d415843fe8a2e33d/37027496304.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aceede8135---sozabesewole.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/f57109cceadc5eb9c9cf197ccc0f4213/tikofavezutumusem.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=children%2527+s+nursery+rhymes+free
    • 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_off0000d119.bin
45989d0d967c8dadaf14bbe50a1d69b25dc086838116c76b24c88c8b6537ec7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD119 4980 bytes
font_01_sfnt_off0000e1e4.bin
e9ae33a6b2c7c3ae13a445706711735bc2f5de2ca8a94426f2f55d3edf3d9e00		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E4 10572 bytes

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