Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c3b5ac187ee9b42…

MALICIOUS

PDF

110.6 KB Created: 2021-09-03 22:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7530dd35d659743128f0a4b2dab2c6fa SHA-1: 8bc243b583a89075cc69ff9a8815cdfbb1967939 SHA-256: 4c3b5ac187ee9b42e37a4ec2b12bd38b48cea1608e7379d2178a3c0be8b5be77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains, likely to lure users into phishing scams or download further malware. The presence of external URIs and link farms on potentially compromised or disposable hosting supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=ernesto+laclau+a+raz%C3%A3o+populista+pdf PDF link annotation
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/05ede78d7c1b654589eb41402854bc8d/xofuzinup.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/zigevejimivuzekaxizagi.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/rebijafuderigifadedetuvu.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/7a1a2b0657e58afa59326cc40cae0940/72328377535.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/c682659327d57e823ef907860f41cd17/81845544878.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/5e9966930fd3e3ceb9a5b8e0a33d9d04/67318144328.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/90943047554.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/7d543016cfe3bad6ed7db57a75fee168/93523090905.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/43070851498.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091f4bd836eb---nexusutibomadolapuzover.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/85988536084.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e0bb132b6---dimujeb.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/74014370169.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/jinuvezagagifes.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/fdd700b11ffd81ce5c294d7bc4cf8291/34205601452.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/59153360712.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/89517864285.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160972c6f3d1a5---ravulavamopeleti.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/590062e1d9a917aaddeb100abbe83f42/8388201947.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/e0af1f131e83ee32ac69e54720c9cdcc/wewivozaborane.pdfIn PDF document text
    • http://meadclassof1991.com/clients/c/cc/cc689d7a74a098ef67b43942063c7ff9/File/zuvujaf.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/60372343784.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/tabixugozivojakiped.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/78696679119.pdfIn PDF document text
    • 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_off00014274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14274 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A8B 11020 bytes
SHA-256: c1e331eee546ed60f0b7e44409233a614ac1b72c403cf541058608c658a3a00f
font_02_sfnt_off000173dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173DC 21836 bytes
SHA-256: c3f5ce11e4ec9c50f1a015f1db85f4e36b7e2f214e824c07b25e2fefdf034e44

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