Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed1602e4ecf65fb3…

MALICIOUS

PDF

84.7 KB Created: 2021-08-23 17:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb5a720c4f9c8bafbf373e332fc961b2 SHA-1: a9cf346642a7f91500e4235c962b7da4d3b11820 SHA-256: ed1602e4ecf65fb39985fe67e01539989d85ada431113b8c1da11f0bfbe14cbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely lead to phishing pages or further malware delivery, aligning with the 'Spearphishing Attachment' and 'Malicious Link' attack patterns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/5fscgn7re79n6f9mn3h8bugaa7/nawiteb.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/spmb0uju3ralajpk5qfcurqlvo/96180056213.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/06d82176eb1dc73459cab730a41e79a7/vusul.pdf
    • https://markaoyun.com/calisma2/files/uploads/xugikepoxikajimu.pdf
    • http://insightonafrica.in/userfiles/file/60728027881.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d50e0d992fc---809162899.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98b1ac8380---papoxofafokawewozawavipan.pdf
    • http://pijntherapie.be/uploads/files/71116471333.pdf
    • http://artstudiodesign.it/userfiles/files/zukamesavaputa.pdf
    • https://conberraquera.com/aym_image/files/wozakirixeterurabilisuki.pdf
    • https://al-wesam.com/userfiles/files/zijinadojijiz.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0def959ca---96799416954.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/e1e1101d9bfcfbf2e5ab4b90585c165b/woximekivorefakobagoxabem.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609a646f38727---runako.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16109c0da3e1ec---76338665931.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad414ab1238---53883063134.pdf
    • http://mopron.ru/upload/files/wirakibuvafataxivuvav.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/1e6137f8654b9223ca776365962de501/dofubewudelututabafejafig.pdf
    • http://ciarajewellery.com/editor_upload/file/befiten.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6e355e008---75950997685.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/99405f988cc3c75bdd9ba703c380471e/64751840364.pdf
    • http://nena-artspace.com/ckfinder/userfiles/files/pujazuwusazofub.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/40450141131.pdf
    • http://heibldr.hu/FCKfeltoltott/file/20961666967.pdf
    • https://alves.bg/ckfinder/userfiles/files/fogefivujakuruwozojadewa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=shrimp+tacos+with+cabbage+slaw
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e578.bin
6b8212ec3128f429345cb20c2ec3067a1561024ba4324cb9df8d7d229124e9f8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE578 17624 bytes
font_01_sfnt_off000113c5.bin
b76bacfa198086c00e1ec10bc998426f0f4e70665f48ef2dfb8f3afbcb99e89c
pdf-font-stream PDF embedded font (sfnt) at offset 0x113C5 11020 bytes
font_02_sfnt_off00012d3f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3F 16792 bytes