Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c96cbedfc68123…

MALICIOUS

PDF

85.9 KB Created: 2021-09-23 21:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 019635e929052de7ec9d85261c528aef SHA-1: 8792b06b66abe6c5b80beaf18d28ed7ecb114197 SHA-256: 83c96cbedfc68123de94840baf72d0d09c514efc81a03a9428ae32ca00975d94
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' lure and ClamAV detection as 'Pdf.Phishing.Trojan' further supports a phishing or malware distribution intent. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/uplcv?utm_term=android+extend+application+class PDF link annotation
    • http://teplorium.su/userfiles/file/dazamiruserefogikenubobo.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/84815559752.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/68620823560.pdfIn PDF document text
    • http://shosholoza.de/file/43823563387.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16135c0d191040---pemojepulijode.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/xogomerurirut.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/nowegokomisukatebe.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f7bb9b263---28788524347.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/80389646266.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c558d0f71---tudisumujopexagos.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/4e3e2f0e315eea11d06fabcfbce02101/41161215492.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/92423127245.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/koxilo.pdfIn PDF document text
    • http://hkalc.com/userfiles/zutulawikoruputiw.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/diwebobagezivugijax.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/memitediradelonanaxo.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/82984817344.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b74f22da3a---garuribobejonolobil.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/mivatir.pdfIn PDF document text
    • http://proficlim.ru/public/userfiles/file/fexawupe.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/nuximidudib.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_off0000ed53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED53 17080 bytes
SHA-256: 5997ebd4298957a8637795febf4e63d09a58cfeda111fa3458acd5ab4427a8c6
font_01_sfnt_off00011965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11965 10592 bytes
SHA-256: 19db98f53cdbd7a6692c575062492b2ee5c84ee898b5c84ec7deb55b7dad05a4
font_02_sfnt_off000131b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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