Malicious PDF — malware analysis report

Static analysis result for SHA-256 d93e9f82c54cb445…

MALICIOUS

PDF

84.4 KB Created: 2021-09-10 13:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 39ebe8e7608a9f9b29a6fc90382d6647 SHA-1: ecdb66d4d1f2712c95ccc69e57d41a0d3fbd4c75 SHA-256: d93e9f82c54cb445bee260b70b5063f8f39aeafa0357316dd968e14075fe1b47
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous external URIs and links to compromised WordPress upload storage and disposable hosting, indicating an attempt to redirect the user to malicious content. The presence of multiple PDF link farm heuristics further supports its role as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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=demon+slayer+kimetsu+no+yaiba+movie+full PDF link annotation
    • http://hardiebase.com/uploads/assets/filefile/66664871505.pdfIn PDF document text
    • https://ksboutlet.com/file/files/36996844748.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/q31mdo36p36am13am5elk0eak3/luzubikonunenewaxudofoziv.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/68486637357.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/romot.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/bojudivabarenolig.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/161306c804bbf9---boruxujuxobujijubilonul.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1630569284.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/gerutenujotu.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/fegamasisowozine.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/16305329091320815391.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/7714476796.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343d17093d7---rapozugixuxusuvemazinibu.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/gowodox.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/6726236105.pdfIn PDF document text
    • http://pbpharm.com/upload/files/mibuxobivefapifadu.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/pororojofowazatozilusajo.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/31072928672.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/98398412686.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/kedodexabuvedanofagifif.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/motavesijigimin.pdfIn PDF document text
    • https://equinox-e.com/upload/files/togipelalukowowat.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_off0000e137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE137 10888 bytes
SHA-256: 60e9ec17b466aebdf3a22f30bb60865391c2a581fe725361cb41ef8982c2e66b
font_01_sfnt_off0000fa78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001128a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128A 19080 bytes
SHA-256: 9cf94fa22a6988dd70384cf7c9675debcd5577d581fe70eef4ef8bf6ee709744