Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c1c541e73ec670…

MALICIOUS

PDF

107.2 KB Created: 2021-06-29 16:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 763cc81add526a4d3bed46ed4270c156 SHA-1: 046659bd59ba9c6103b9b71c4ce7995af926684f SHA-256: f1c1c541e73ec6704453119bb4bb59eb8f6c7c0787be0777e4a7fe9b843ee7c6
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure as a link farm on potentially compromised sites is a common tactic for evading direct detection and luring victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/dc347893e5175e49a8e81dbef5e62252/76674511373.pdf In PDF document text
    • http://se-ty.ru/uploads/userfiles/file/15888032725.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/foxaxidezeza.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608be3f27eb9f---jilad.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210514000915.pdfIn PDF document text
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/zejakipizevezax.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/tapijuwoxumisilege.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/dte10pbr49oai94mdentbq547d/84975672712.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/pubitosefol.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/b2cf31a0571926184a490639aa74f49d/vavigefuzikusivebuviru.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087599472dfd---juzisivutexuber.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9c63f3867---99452262911.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b62c873eacd---jipelimalabevokorivuz.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b832a6c715---31373080216.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/55189213265.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7791f94c9e---nemojin.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/3621f3c211a59d54750edb228a8d64be/tevubigeboj.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/kerixilesojusizigufozesox.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/836995348cc8bd80615252178a6575ad/71447763878.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/86642630615.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/wibitakibukunefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=st+monica+prayer+for+conversionPDF 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_off000142d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142D4 10848 bytes
SHA-256: bf67b6da3203065931ca2e31031eb6a5466e062b2f5422e2bb1e43e9e45ef152
font_01_sfnt_off00015bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000173fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173FC 16916 bytes
SHA-256: aaaf4e0f4e9ce220b252eec3e14607d3166f26457e612058680d1a120bead8eb

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