Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ec66233c1bfc486…

MALICIOUS

PDF

71.4 KB Created: 2021-09-26 21:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e803f204eadd21b13ca3bc10da766381 SHA-1: 312f9c0458af7ccd4845f6955c8e642c48424836 SHA-256: 9ec66233c1bfc486a6b5c4285f41877dd38980288fdf7dda76b3ba636d5275c1
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The PDF's structure and embedded URLs suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/1217a6d6f0341780b428b334c1f9e03f/zamonifudise.pdf In PDF document text
    • http://www.ecostroyservis.ru/File/82081322970.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/vakenanuxoxege.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/folirigasowukagavujuvata.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/83082789944.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/zupikesojanosejuse.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/gadesejobu.pdfIn PDF document text
    • https://themalc.org/files/file/potoleve.pdfIn PDF document text
    • http://smartvoicesys.com/userfiles/jezojepabagak.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136e5fbcff04---vibetogafikiwukejadomu.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/99529006372.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/xazolezepijonoxenixi.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/48446519261.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/valerugodizekax.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/25370549364.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/fodupuketuwixiji.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/54678096610.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139a444b78e4---49786269167.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/27448430541.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/63739689601.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/85672252510.pdfIn PDF document text
    • http://mfahk.com/upload/files/folekasare.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316b2492f2b---37097027361.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/1758200226.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/210437795.pdfIn PDF document text
    • http://air-ned.com/uploads/files/gebikabezemajugepulorade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=pokemon+sapphire+online+emulatorPDF 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_off0000b5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC5 16332 bytes
SHA-256: 34c4f281e587307422331d078a5ab78ca464835913d60f10bb2feaa399188f84
font_02_sfnt_off0000f6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F1 10708 bytes
SHA-256: d3792179c31a1326a784af20ad5955271588c93b5f4149abee18146b12fff0b1

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