Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d12d264ed14c85…

MALICIOUS

PDF

81.6 KB Created: 2021-08-30 06:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: da6f869c616a6c0dc936727e82496549 SHA-1: a26f4d38fcdebebf18a47dcced3bc990c66c562e SHA-256: a9d12d264ed14c85136fbf23ef64da569e9417b71ac4eefe52571b84253a4a9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external URIs and embedded links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted from this sample, but the overall structure and URL distribution indicate a phishing or SEO manipulation attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crysiq.ru/uplcv?utm_term=previous+year+class+11+physics+question+paper PDF link annotation
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/c89147f2946e44e4b722b62afd9197d3/sewopujowesopabedumetux.pdfIn PDF document text
    • http://derma-dts.de/files/file/remen.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/7e42fff3e1ce35128b3e05225642391b/53272032425.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/pajitulovi.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f27e1f0c046---pawupobisoko.pdfIn PDF document text
    • http://francisfamilyreunion.net/clients/870293/File/sapisesowexotodupu.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/83986753407.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/geradisexozokip.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/foxuporaturigiwupoko.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///negibowa.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/42151555366.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/letuderawifimusane.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/45608204860.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612b2ab91cc0e---xesonitix.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/69551562218.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755da89335c---57401253636.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/74567632737.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/n3lkhmv4prjr73u7ht1u6m2n42/13212722088.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/kotebironaji.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/kunopawelunobemibokeloni.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6af50d101b---nakasodedomuro.pdfIn PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/45828789941.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/hrtdj49fvar9jfl0vv5okjnpl6/rofulovilupasezijelanim.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_off0000d9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FC 10952 bytes
SHA-256: 115316eea09769e02d1495d1d9b2742fe2a43fced8d5e237d5dd0d2843006c99
font_01_sfnt_off0000f36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36E 16736 bytes
SHA-256: aef3cac7e63e91fdf3eaeec54887ae6d392452501f09ffc1a7a224f8ee2c49ba
font_02_sfnt_off00011e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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