Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca932a42d968ea4…

MALICIOUS

PDF

81.2 KB Created: 2021-09-07 08:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a5b8b3186231eebcb4f3fb90a9558fb0 SHA-1: 9f4b19913729bb6e9c46b2e1966c26ce1ae06208 SHA-256: 0ca932a42d968ea419755350d52740330199f18f90e6cb8d0355a19548a1f78d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate an attempt to redirect users to malicious sites, likely as part of a spearphishing attachment campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=website+design+document+pdf PDF link annotation
    • http://mtsskzy.com/userfiles/file/joketirujodaga.pdfIn PDF document text
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/bagosawutoxaji.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/gotuzos.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/c8fe9558dafafc6b4658d907d9c9816b/mafuli.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/wirapukuwipetokutodexezet.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c87a5ac8b17---373908416.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/rozexefekagima.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/6dd1e4b4b6015c7fc8149c1410ac6fe4/35945225348.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/75615609197.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160efdae08236b---61233249054.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/terukok.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/winisibetiwirifigexonege.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/fejulosuruleluwigiwubu.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/24483810020.pdfIn PDF document text
    • http://mariancozma.com/_user/file/94478462123.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210707055325.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083577f0d5b3---52671143564.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/fafati.pdfIn PDF document text
    • https://banghenails.com/upload/file/83562201808.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47ff573d5d---17599105442.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/dowuzoxo.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/nujoduburodekikasoxeranuf.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/kevepujipuxujuwukudali.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/boveniv.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_off0000d869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD869 17780 bytes
SHA-256: 7d0928c99e5b2ccf6ae1a5aea41b17b38518fc41f208ebd53e779a4b9c00a9db
font_01_sfnt_off0001061f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061F 10888 bytes
SHA-256: f5173410c52efc1825c170ebf150bbf3188bd1a78ed4e3c5ecb879efdcd52c72
font_02_sfnt_off00011ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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