Malicious PDF — malware analysis report

Static analysis result for SHA-256 9678a73c110f10b9…

MALICIOUS

PDF

88.0 KB Created: 2021-08-24 09:41:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a7ccd40ac4d09f12ec9f6601e76da79f SHA-1: 17d0cf76f47b9b92e4ea4106180d260a120f32b6 SHA-256: 9678a73c110f10b996f04d88132ab8172a885a54cd7f05b4bcaef5f94015b20a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • 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://medvor.ru/uplcv?utm_term=find+hidden+app+on+android PDF link annotation
    • http://ampletrekking.com/userfiles/file/2687109405.pdfIn PDF document text
    • https://brs.jo/userfiles/files/rugevurigida.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/00b13dff1daba19bc628b7e3902862d6/33221214785.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/jefareruve.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6d130c0e76---3178408643.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/28486606837.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b350b0dc1cf---wujadalubuxosumojefufi.pdfIn PDF document text
    • https://777mto.org/contents//files/52938585585.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d2918ed4ae8---relagetetogopixizusoj.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/55a5328d3bd34ccb648ce047e15fd7d3/61500125611.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/basubepetonuxaribe.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/hgojpsmrdsdsueku8c7lcmfoc5/19324826353.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/27869425801.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/96384741109.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/eq0qpk20b01cphptdgvutfmvv5/9104390577.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/vefoxu.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/5a22bd30b87167efb7b14e5d7c18e61b/lerifesit.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/e8gp3f9pro9a6kh4tc4nrse0n2/61275255457.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160da0e45186f4---90035623610.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/budogofariradarotene.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df19330a63---gajomapedejowawurax.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091e344c23ee---54891001525.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071a6fa9c42c---73544654509.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_off0000f681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF681 17252 bytes
SHA-256: cd3f14295d31e448e9477ae9d3a5f91bde10aabf32f34d259472926f34f56e81
font_01_sfnt_off0001235b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235B 10156 bytes
SHA-256: dff6e04669fda91762fefe8e0d4170ae3733bf238149d629491474132fb82786
font_02_sfnt_off000139d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1