Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fa2438a3d8f1366…

MALICIOUS

PDF

79.1 KB Created: 2021-09-05 17:34:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4074e86d03d5d8073dcb90a611ee2b6c SHA-1: b9a8f1323e878158f70c2ba108cf49c872c56fe0 SHA-256: 0fa2438a3d8f13665dd74a4aa511be539b7e61692e653751ff9007bd65456196
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised CMS upload directories. The heuristic firings indicate it functions as a link farm, likely directing users to phishing sites or further malware downloads. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=cpu+parts+details+pdf PDF link annotation
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/f0788001416a363baa1b7d6a692056f5/gijuwumofuvoz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c34e6629fe---parenefiko.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/88608661333.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d006b377164---nisumagunu.pdfIn PDF document text
    • http://fructusartis.com/i/File/vizizomaxuzufigunel.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/bopokofimijolidajoluz.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/29925af20cfcc0d8e4d2f89791777890/3565659513.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/83793840172.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1627591517.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/nuterusesuxebi.pdfIn PDF document text
    • https://777mto.com/contents//files/runivugenakugekugabizivad.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d309961106a---lopiz.pdfIn PDF document text
    • http://guowangcable.com/d/files/39823980969.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/23m08k34g0fg6tjb608fhakcir/nizegisujuvixomopekasavo.pdfIn PDF document text
    • http://wenxuezj.com/images/File/vujikapapejewopa.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/r0d2q44j6iu7b2d9km0r087jga/kixuwis.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c07c91c3a6---salave.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/49248772186.pdfIn PDF document text
    • http://erex.hu/upload/file/52550068075.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a383d4ebcb4---gategivemegi.pdfIn PDF document text
    • https://andrejc.si/files/file/15851751871.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/27860196612.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_off0000d25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25C 10400 bytes
SHA-256: a1c31d59ca5d19617462af5db24e868447d0b3a6c57b3ca229622e9f4e5feb68
font_01_sfnt_off0000ea04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA04 17236 bytes
SHA-256: bee73bc18cb15d19669b593416d08d5097f704b4c97aabf78f3928d6eea0af6c
font_02_sfnt_off000116d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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