Malicious PDF — malware analysis report

Static analysis result for SHA-256 438286ab332eafbd…

MALICIOUS

PDF

93.5 KB Created: 2021-06-27 21:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0de96a94a953a41391daeef551251279 SHA-1: 567989a90859ea494333d9ce08997fe9799d37de SHA-256: 438286ab332eafbd8fcfdf6a2f4cb50ee9c0b283ad326a09449e69c5d03aa8b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document that contains a large number of links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves tricking users into clicking malicious links embedded within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://paperland.bg/uploads/file/genetibig.pdf In PDF document text
    • http://plafondchauffant.fr//img/user/file/37588087205.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d11c2484f---54963761767.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9d9a9c0f4---vexadogusegad.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f427d8d31e---37551995583.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/81102693833.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/45750715510.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/90005354520.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/2c494c27f1b0c6a57eea7ab043cfa99c/27237110566.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/21ce1d6bd92c433f40af75f5c541dfff/80165140574.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fff6f8759c---jodokobamugotom.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acf0ed86e14---31667190457.pdfIn PDF document text
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/zejer.pdfIn PDF document text
    • http://ruihuitax.com/files/file/wutetug.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/c79fb61501ebe3b806d69035f2e24c8d/12202593366.pdfIn PDF document text
    • https://ahha.az/userfiles/file/sanitigagogebakexabemi.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/laduviwefexuwonuxukivi.pdfIn PDF document text
    • http://zlato-invest.cz/upload/files/25241373996.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/nobolabemovuvonigi.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b13f834b24---melajeburo.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/55698930752.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/e57a877b150b8a528dc06c49dfe89b63/vibukavogazigusexo.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/oi6qe6snullavnpur12etqqsn7/88232306370.pdfIn PDF document text
    • http://jucal.es/images/file/88611609497.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/56763461a39ac127eadddde13d8cb815/77335600142.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=harbor+breeze+centreville+52+manualPDF link annotation
    • 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_off000104c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C4 19276 bytes
SHA-256: 06001f697bd6814519721e4f53671844aa7002a1b9064081cda97fe70f3d7c56
font_01_sfnt_off00013736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13736 10832 bytes
SHA-256: faf2f46d708424e8b11e79d937d5b5cc5f113c62845d3e907a1d00049733b2a9
font_02_sfnt_off0001504b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1504B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1