Malicious PDF — malware analysis report

Static analysis result for SHA-256 af2f9f4e79d92609…

MALICIOUS

PDF

86.8 KB Created: 2021-07-01 11:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 90b7f4d28d4dd9d7739448527f5ff313 SHA-1: c45324d9112a2b015d814f62b818de32d11a40a0 SHA-256: af2f9f4e79d9260987785c5fb50120a9fc027dbc4118c49b28915748fccf6ebb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://coretry.ru/uplcv?utm_term=rpm+for+milling+steel PDF link annotation
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a41b651bd78---21530358503.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/41756504881.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/16682966080.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/latuxizidujigusolepeguk.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/20174073239.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/33709775764.pdfIn PDF document text
    • https://songhong.info/userfiles/file/fulibunaganuripozadatel.pdfIn PDF document text
    • http://proxima-design.cz/files/file/80668272430.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2b66cf7a5---paxolalolitaxabavogos.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1676eb0b17---notowemapuwi.pdfIn PDF document text
    • https://aedwea.com/upload/foto/75024093971.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b198cebb708---dosoresasugel.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e52f413c9---9275303379.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/xexigun.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/hm43lqqdk8s8315n738hug6uu3/worovirafuxuvad.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/17369961171.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9f8e8955d---mozugixenorudisigu.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/06-10-22-25-42-93.pdfIn PDF document text
    • https://energooptima.hu/upload/File/84657607541.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/51127860313.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/keljbpnbo21s9v8c66ingorjt0/79859693375.pdfIn PDF document text
    • http://drironcat.com/images/file/puvozovuwibimiwuwijebufup.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/616cc0b757c33834f99ab3d424dff42c/vuraxi.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b709c06f85.pdfIn PDF document text
    • http://riph.pl/userfiles/file/maxitolujetonenigutop.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_off0000ecfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFE 18020 bytes
SHA-256: b279ba7fbbf5b4f92388013cdc1f0f1cc5f77da633c1bda3b8a018400262ce08
font_01_sfnt_off00011c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9C 10584 bytes
SHA-256: 807ce857ef69584f765892c9578f35fba8755adf804fc158dce448542bd35be6
font_02_sfnt_off000134ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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