Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a073856c1a00ff9…

MALICIOUS

PDF

77.2 KB Created: 2021-09-07 13:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 715d78f237450f8e278c21f402920f7f SHA-1: acf9e19596d03fb0f8cd72ef15f16bf709936a88 SHA-256: 3a073856c1a00ff94467df2ef816426d385ec5e8877442e79b6754d37254f877
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous embedded URLs that point to compromised websites and potentially disposable hosting. The primary purpose appears to be directing users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://crysiq.ru/uplcv?utm_term=if+conditional+clause+worksheet PDF link annotation
    • https://bajrahrs.com/userfiles/file/3116395353.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f44a2a541---gusozujisamanofapowaf.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16073e6b8eb133---40576432723.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/95876987452.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/20853a42328354275cfc9603e37cb92f/galenisinitapujexiro.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/grh6j6ink6ch3pibentcjpvh29/rolizakibamuzago.pdfIn PDF document text
    • http://www.celso.org/download/77155567486.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb0cca3091---35142395674.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/96992847052.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608280cba7740---tijegilenu.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/93570404866.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/895afd912df5025aef0ba8b773e950e1/gobigubelobavokelenif.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/6508076935.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/pexebav.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/nagixajavedutifikum.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/feliwixigelifelifuvu.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/6f8789518f53da6e0b9656b81d4fd82a/97976095967.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/320177718.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/853c4927d7f85a8a5df88fa4f091db5e/gagulezosezogebifonedet.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e1be4f871df---megupinetumarapobe.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/burigez.pdfIn PDF document text
    • http://shelton1961.com/clients/35589/File/83644808519.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_off0000c5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DF 10800 bytes
SHA-256: b5943bc614273c89bdddd50655089d728e61a2021ee7bc4a72982be63f1caf55
font_01_sfnt_off0000decc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DE 18620 bytes
SHA-256: 84b60f6cd1de93fa7f0ff51c53d368087c5515af652213e5ec2727de766cc2f2

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