Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cf705b2d7efdfc2…

MALICIOUS

PDF

80.2 KB Created: 2021-09-08 04:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 64403ee402d0e6c9b52720ae9321c3f6 SHA-1: 0f65365e9fc11a831f5c3c15a409b0c4be5291ff SHA-256: 0cf705b2d7efdfc259d290045ecd3b6826cbf2183496f8e39c559c61be87594a
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://ketchas.ru/uplcv?utm_term=bodum+automatic+pour+over+coffee+maker+manual PDF link annotation
    • http://gndpta.eu/news_objects/files/90034218629.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/54739654012.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/wolakomoliv.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/4231466466.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160739eccd7cde---kutaridawazopiba.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/zawazu.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/17000305808.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b63aa926c4d---mevuxi.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/bb878b35f3e28a17ce5dca7efa1ca5d2/158165311.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/sufaduripumi.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/501d66591ad67cf795ef398cfff90419/7050502378.pdfIn PDF document text
    • https://slaterlighting.com/wp-content/plugins/super-forms/uploads/php/files/b67d10c40a6226e1862eab3f7ee045bb/lafepavizu.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/15470376447.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/zefedezifefimatasumi.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vomosegik.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/moxumetukidevogoxasafinu.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/46758236595.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aabb8df03b1---8930967496.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bfe24a29f---90956932617.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a610f2d56ef---jamaxipigalalajozikovisux.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5206474128.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db16dcfe48---tazamu.pdfIn PDF document text
    • http://thejosephinebryantfamily.com/clients/48776/File/vufoba.pdfIn PDF document text
    • https://ckmandarin.com/uploads/vumemajurukumorim.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/69360306584.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/18757490965.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_off0000d426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD426 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC38 17600 bytes
SHA-256: 584d9114f645b77ac4021a69b3533563a857218dd3113b066a744b225126303f
font_02_sfnt_off000119b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B7 10924 bytes
SHA-256: e7e945f81b1624b2fb9f057afd0e171e03814e12698754b77d20e48cb1c51cff

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