Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d5b7576cd318fd4…

MALICIOUS

PDF

96.5 KB Created: 2021-08-14 08:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3a352d61ae850196e2d5b9d241bb67dc SHA-1: 63860284f6454b72cecfa9e12f87ab9ad470cd9a SHA-256: 9d5b7576cd318fd43c9a6512c5eb732af373d4f751126b35e3c5fbf604cb2fbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farm heuristics indicates an attempt to lead users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://crewmak.ru/uplcv?utm_term=gramatica+c+the+verb+tener+level+1+pp.+91-95+answers PDF link annotation
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/f92660cf98be3e41e75a44aad9d36bd2/fapijomivovifumi.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/161052d3855d6b---6788974924.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/wojinaken.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/xitorigasevikarov.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608791b7e4d05---37166451035.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/um9p4lcggak8chdf0h8f8613i4/49383015344.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f15e8b3eb28---muguvomevutodumuzokureso.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/f9bcea4a8c4885888066040d21466f8f/14240277898.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/b7e1ee5fccd5468fde87f992b1d63533/95291253283.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/rojenewu.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/22505780295.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/67647771682.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd3aefd6c51---99765594172.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/sudobenepewuvuvo.pdfIn PDF document text
    • http://tauzetaques.com/clients/1/1b/1b95303171b4519794d6fee637ef680e/File/zogol.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9e926fd2f---woruzovas.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/sonivem.pdfIn PDF document text
    • https://mszukam.pl/dat//file/5260416225.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/19463867784.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/vorebusaje.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082762de238c---9814089211.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_off000110e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000128fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FA 18692 bytes
SHA-256: c6943d7f363ffb5e6ea90d0bbbe979826385d4aea72c2c5e6168e18c2a2a8791
font_02_sfnt_off000159af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159AF 11304 bytes
SHA-256: 5b8eb9c3acc5b6fb864b1cd40498eda21c933f24be19567c779615e5e8314c68

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