Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fd84c7226b79a33…

MALICIOUS

PDF

88.2 KB Created: 2021-08-09 06:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9542a3d751453c66bbbabc13e14e47fb SHA-1: 82a8ef605a66339fa94d3cf77c0a0b0d666b60ce SHA-256: 9fd84c7226b79a330e56127db5fbc2c7e1d43b08c1254e7d241f6cfc0f7b3481
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings point towards a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://medvor.ru/uplcv?utm_term=bibaho+obhijaan+full+movie+download PDF link annotation
    • https://serviceservice.eu/userfiles/file/49756807622.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610efe5e366a4---gulutiw.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/xoburibapawur.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2f86c88bb---mozisunovikemifobepegevob.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/91459298757.pdfIn PDF document text
    • http://thehonourride.ca/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/manise.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/71111570273.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/92a5175bdd026b42b45f6f7f23652c86/butixodagixu.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/89739017743.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/bebepuzopat.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/pipuxusek.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/63406500915.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/5a8c530b9f47df1830209b28434d3bad/fewevevubuxawerijazizena.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/79646500077.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/debefosalapekupowetaxuwa.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/9a4008992e7048e8d145271dcc23bd6d/30365727293.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/1cf10f349c25775408e0ad9837589288/51000730338.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/72936823704.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a711bc08e19---85458291116.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/r5qjtboeuiesll860srej7eiih/tujitikekanukiwekitusa.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/52531642950.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a38be63cd92---tizusalad.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_off0000f68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68B 10828 bytes
SHA-256: 576e91ca3440952cc7a6ddf6f9a2f489c97ff8b14fde0b3e99917ac91a59aa22
font_01_sfnt_off00010f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4B 16816 bytes
SHA-256: d912ca2ee9deaf99a1a5351b25287178c70960ea71a5dce36eeed0456f6c7351
font_02_sfnt_off00013b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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