Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ba7af106bbc2b59…

MALICIOUS

PDF

85.4 KB Created: 2021-07-20 17:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bdc2fa753078a34d313155fe34f3e5c6 SHA-1: 1087b976e2efd5fedc49cbf025ae4f0be21cb662 SHA-256: 7ba7af106bbc2b59f3977a4edc4721aedc8b2ca8d3688d28217b5b612198e6c8
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of multiple compromised CMS upload links indicates a pattern of exploiting legitimate sites for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a341f277d9a---2800141710.pdf In PDF document text
    • http://perfecthospitals.com/ckfinder/userfiles/files/kejopepixojetorigeli.pdfIn PDF document text
    • http://amdind.com/userfiles/file/32049887474.pdfIn PDF document text
    • http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/zepipapumibosaru.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/b262bf46b0bd4ee235f1f5de76fcb57f/vevasejawagekeleka.pdfIn PDF document text
    • http://kbchina.de/upload/51181662534.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/14850944647.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f0b6058824f---zurodenuzajibeverazigareb.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/fafuvusasutifoboz.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/73668273548.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/e4m027nmphuaugcoovqm27n5e2/19088194401.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/detutejanugi.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/70374097686.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3a0790737a---vogesefo.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076965641e81---fawudiwot.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c870452267---jaxejarupogefosivof.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/a5664ac66d31c85eeacd7315207da1f4/borofejegizinowa.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/jomugusu.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/346b87990f52bda5ea31ec3f47b9d644/nogutesojefuratupojikusok.pdfIn PDF document text
    • https://aokman-drive.com/d/files/mixagobesodute.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607f967987f71---25088228385.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0ce6befd8---vuwepalufumole.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90d30dac74---38060795782.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16094eaa38498c---79091392492.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=sudden+pain+and+stiffness+in+neckPDF 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_off0000ec3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10456 10612 bytes
SHA-256: af9b9aeac147ab3af14badb31353c8318722b3c5edbfb86fece55c35365b5a42
font_02_sfnt_off00011cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC4 16740 bytes
SHA-256: bb409c11cc6a091eef80c10d6003c49d59c74dfe80d810e68c5db61305b978b3

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