Malicious PDF — malware analysis report

Static analysis result for SHA-256 1972c0ba9dcb9782…

MALICIOUS

PDF

78.1 KB Created: 2021-09-05 05:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f239a85bb9d4c610ac026fc60acb0bfd SHA-1: 800a869e1687e78a21ba90dca7da02c94e5a36a3 SHA-256: 1972c0ba9dcb9782e8be83a540f04747bb0bf828bd55b9647f85f3a662bed5f2
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The document body is heavily obfuscated and unreadable, suggesting an attempt to conceal its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/e6c9f981e78a4b123bb1fb003926fe51/redelurunuvezilupema.pdf In PDF document text
    • http://pogservice.ru/userfiles/file/70609491892.pdfIn PDF document text
    • https://cooperspick.com/files/taxaje.pdfIn PDF document text
    • http://grapevinewinerytrail.com/clients/876125/File/mefow.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/1f5a1b8294ab7f1594e9cfe6aa228371/dexifaxilexasa.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/54329633275.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/omup1ba18fb25v1151khqui89e/32018552764.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/615044d8b942d6ce4f7eb88df3d5b27c/fosinotevisejuvan.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/bec1dd2dafc46a5644d642eb45ef1c18/13548694304.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/janonenetola.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/96429298641.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/mivok.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9136b3481---13010303932.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/1gn8ntdhis0rm69bjs66mncavi/bubire.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/1689495712.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/lezubesupo.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/fozupikipevopuxala.pdfIn PDF document text
    • https://loctra.net/userfiles/file/nigegexusuzotefadofoweb.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/mojib.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/durogozer.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/61297601665.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/77015643477.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=nom+035+ssa2+2012+pdfPDF link annotation
    • 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_off0000cb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB51 18096 bytes
SHA-256: 99e82abf1530015dfbba44b26ac15e2a34b9670157c89606422aeb084540efa4
font_01_sfnt_off0000fa24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA24 10664 bytes
SHA-256: 3587570dd87e1cab1d4f166617e1c3ad877024a313a6e3edd15070195613d8ab
font_02_sfnt_off000112ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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