Malicious PDF — malware analysis report

Static analysis result for SHA-256 0afc3b8a02681a6b…

MALICIOUS

PDF

77.8 KB Created: 2021-09-07 14:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f9f21c75462211ff0d27407443e8c989 SHA-1: c6a24d24801cae30317ee4d6b0240e88fdbd67b4 SHA-256: 0afc3b8a02681a6ba560a9ea6bfa84f5a68c17bd2b6d511852e9e63526fb3a19
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 embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious or phishing destinations. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but likely serving as a container for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://queure.ru/uplcv?utm_term=auditing+and+assurance+services+timothy+louwers+pdf PDF link annotation
    • http://buyyoutubecomments.com/ci/userfiles/files/xalerej.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/33323ae06d7180fa61f89d9538ba83b6/lesotisijuboxirijumanine.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/wunogefiladazix.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6e12f0935---vegakiniruwig.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021051410430620.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/35980138936.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160710c08715e2---15717169821.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/71ad0367d75738da0655da864fd921c7/tipukisirufemuxelu.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/7ca29ae3d07f3f1a0c5857687bb9f14c/94398665425.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/renevap.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/tekawutirekafiv.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/xamezijifizisujaku.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/3130983879.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/1921188206.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16089c49bd2b97---neruvilanid.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/suvknr0aifskb3khok79iie9l7/wifebafemijamodow.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/1a4f07662c6a375101750fe2f2104f6f/tagijobajisulizil.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/suvanimegive.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/38020016219.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/27322568677.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/g9d9n8rfk93mh2okfb17ai8sqf/37856683325.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/30399651812.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/sogazat.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/67277820887.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091cc8cdb4ff---74998066916.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/zidagudazi.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_off0000c5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF0 18100 bytes
SHA-256: 8ad8f6c5bb31a9e599bddb24987b37ed296a36975e892373fa71b277ce76ec1f
font_02_sfnt_off00010c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3A 11412 bytes
SHA-256: f96398f1bb6583a1d3cca94cceb77850a4a0cf1a611a5a034d6b82c2e895fd7f

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