Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d83756bf6a18abb…

MALICIOUS

PDF

90.0 KB Created: 2021-07-14 00:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: d48d6f3fcb4d4b74196924fbd2a651ed SHA-1: 26b5691c6341aeb70533ab0f0dd750c9740b0089 SHA-256: 6d83756bf6a18abbea6bb826962e63714134516dfe224781bacbd26c2a84dba3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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://medvor.ru/uplcv?utm_term=by+what+process+is+food+moved+down+the+duodenum PDF link annotation
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160987fe2bec27---fotesojabe.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/49369327999.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ea74c08c6---75004339509.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a338585d755---46372346746.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/2775bec75d6516f2d175c5e210145921/naxiledos.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/26145734162.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/f0fc47d06ed191a7ee1dcc0815d1cdae/sezufokifewasorifalar.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/61872296662.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce8be335b6---38724847862.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/969a7f82535eaaa7ad19da0d0db31539/31099548702.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/53aa70f9cc879ec63060004ea621e705/rexadixesexobugapuwipe.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf45c5088a6---74157178055.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/dajave.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/48701850936.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a488255b---77031187777.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/2ddfe0057a17e17aadda8aec0d2eee03/57230351999.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ff6f228ad---sokovuzovixux.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/fekewunodidi.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/03ib2mjeqv7ldvmnas5or916dk/xoturifituw.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/vesesijabofuvudavigebob.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/358568cd9d3fe0269e0d51fe4f990d1e/nusujekamudi.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/86598562aabcd56806e1b6e6eb9ab5e6/16833148453.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_off0000fa51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA51 11256 bytes
SHA-256: 52942b95fb0336b8e5abc0c3b7728433751e596ba2de3644a10b4220685c5e7c
font_01_sfnt_off000114af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AF 17624 bytes
SHA-256: 6559671089bc33694bf9b2f293950aaad48b8a5f9cdfee35a5c04c8d5bbcd83e
font_02_sfnt_off000142a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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