Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d68cf5ad1576d8…

MALICIOUS

PDF

90.0 KB Created: 2021-07-16 12:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6e238ab632162fe9c11adb04912fc637 SHA-1: c163bbdd6ff3c43d08aa13d7ddc160e294ead6a3 SHA-256: c9d68cf5ad1576d829465fef13d6cfeca39c1412ea65acc181a50a7ff5378f28
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or redirection mechanism. The presence of external URIs and link farms indicates an attempt to direct the user to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/eb6b268280111026837623d035b5c654/86320848406.pdf In PDF document text
    • https://mytopics.it/uploads/file/89949535909.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/8fh0d585r7p3mfun49phn6juel/namewolaka.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a2875dfd0---86846924099.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/7185d0a5521709005955bb07cdb88014/76910030838.pdfIn PDF document text
    • https://timjanen.se/anvandarbilder/53/files/92640454701.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0ae6995a0---56726329878.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc287237d0---77027932089.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/tewifo.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/vesuvefeladeraxoji.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da429c1b6e1---kebawefupinojavegeporawo.pdfIn PDF document text
    • https://menu2uplus.com/images/file/73611732412.pdfIn PDF document text
    • http://climtech.com/files/files/75854800845.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/pegirujefukesuvufijeg.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebdc289416---zefigujumuluxufuj.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078f2cc75b4e---1930738501.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/zeluwixosixasatomitobuf.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/d2ca56fe26a249c812042bee6b5d53a2/98646568806.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/55330260624.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/793acb84e0dcfd23452c057ba288475f/90155927617.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/74959268646.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/48953969562.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aadf94e10b1---butoloxekofowenekoteje.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cee806e5a---nixafigomuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=medicare+manual+chapter+12PDF 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_off0000fcc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC9 17284 bytes
SHA-256: eb70c2d3624664cf7120c30408de59c9697292215f08afd9b7c61f5363cab3d9
font_01_sfnt_off00012a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14244 10756 bytes
SHA-256: 8fbe4ef4edcd3de62374b7a9ead3849b6be5b4c2f5f6382e8a5df0105213d379