Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c2f1556529d63b9…

MALICIOUS

PDF

89.3 KB Created: 2021-06-30 12:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ceb1d10ed73234a3532f60e4c9223862 SHA-1: 7de5796a88c78d615e6e654fe3160e7d0d6d6bb4 SHA-256: 8c2f1556529d63b95a55ea432b7efbd124b0390b98335fa88935f81df5bbf46b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. No scripts were extracted from this sample, but the extensive use of external links indicates a clear intent to redirect the user to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://irlanc.ru/uplcv?utm_term=swollen+behind+ear+and+neck PDF link annotation
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a2bdb2a99---xevufegozagibopekidasarop.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bba3a3a692a---ridunivajusamu.pdfIn PDF document text
    • http://lucann.com/Upload/file/51925929236.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16076dd9cf3aeb---2166719428.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/95fd1a566bd568178962fc16885f55f7/jererigebofalegojuxil.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/1c71ccb19333bb2381c9cd0899ccc6c8/14080374013.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8eb45aa2c---74137060876.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/tukewenejubaruw.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/21331452771.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/11745583840.pdfIn PDF document text
    • http://change-sexy.com/files/files/durewizi.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cd0eea500---pobudetok.pdfIn PDF document text
    • https://bataretak.com/img/files/file/tofufupudetukiresitupes.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/255dcf88e30c712bff3cfd8ea2e7bd14/49247371635.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845c74e0049---jenovameteg.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094616852063---85072675530.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/18d46b31f893cec15fec3d4e82985d93/33402706930.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/9590c4c4a5f84cd7d6a356dc56e8cf6b/89296961172.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/a14d6ab469e688d6b64785a21851e6ff/15406260545.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/09006dcb634d32ab0a007e32a532f4cc/98694830767.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af87ccc96d8---loxifatesulixoworut.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/9c052f6bde9a1703485dc21d802acb17/8810721581.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_off0000fd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD57 10596 bytes
SHA-256: 433f9170ed9428693ba81e88254c6fb4fe239b9e089d4679a7dde986b59b51e9
font_01_sfnt_off00011578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11578 16376 bytes
SHA-256: 8f1c5c19e338ceca70870ef902ce38f051e843e967aeb75c57d906e2f49f7cb5
font_02_sfnt_off00013ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.