Malicious PDF — malware analysis report

Static analysis result for SHA-256 1760a96fe7c53a76…

MALICIOUS

PDF

77.2 KB Created: 2021-08-12 23:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8bf2244fa947258b296012d10186a720 SHA-1: acc93ebeb97ae597498000c74c4677d78c0af2ff SHA-256: 1760a96fe7c53a76d0b18f6e7e6d16a7d0593e259ba169bf6235e05ec4ee11f8
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a link farm with numerous URLs, many hosted on compromised CMS uploads, suggesting an effort to obscure the true destination. The primary purpose appears to be redirecting users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://yoron.net/up/files/jesijoliwuzazuvimagi.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/24c1cf7608c26292ee55e411646a8b91/diketasug.pdf
    • https://healthmatters.me/userfiles/file/jofabegapirozajemu.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/o7d473metf18u7hmq22p1m3at7/duvegimudenutolose.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/3873cd310824def74f4564896348ff58/vajefeb.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608845862d91c---dubutuxanebatigavole.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/cb32ab0c992b8da0d936d11a3c99dd37/vositegizakanak.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/3541dea37897f08c34d436d38c0d09a5/sonowajoxadegipizererur.pdf
    • https://roweryelectra.eu/app/webroot/uploads/file/16248376747459.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/2fbc8e85f9293529083e67068f0d0cf5/90534029602.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/16b4f4983b10f314c17e562e65aee3fe/diwomalisadefunu.pdf
    • http://progfin.pl/userfiles/file/kelidigakezureguf.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/qdkv1fkmrn4r9s4v7u2v9vcf16/wufafovolukenajuli.pdf
    • https://fanaf.comarticle_ressources/file/41647346891.pdf
    • http://curry-box-deluxe.de/userfiles/file/60098528812.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a0178f3cb77---fotevet.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/dijisegotunofemegomipowiv.pdf
    • http://villabrown.it/userfiles/files/tidesepinewojezowug.pdf
    • https://mariapolis.net/ckfinder/userfiles/files/82980152964.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/7bdc5cc13fb624163de00978c106b3cc/kasuxazaxurobevimudevo.pdf
    • https://noithatkuongthinh.com/uploads/files/90446871332.pdf
    • http://mdbim.pl/ubezpiecz/obrazy/file/nebigisoriroramege.pdf
    • http://al-bandak.com/userfiles/file/belogokov.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/a5ac737b126a61c2c8ee9c17a1d51384/wowolivosotinomudodev.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=shostakovich+jazz+suite+no+2+score+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2f0.bin
332e417246a385f8de21c81047a4cfa54d54cfe9e9d82271116f780428e65e33
pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F0 18544 bytes
font_01_sfnt_off0000f24a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF24A 16792 bytes
font_02_sfnt_off00010a61.bin
58dcfd799740d68b9e8ba0224f5e466f69d2b04442a1ef6b4b5269f2369f42e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A61 11316 bytes