Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd76bde5fd5c581…

MALICIOUS

PDF

86.9 KB Created: 2021-08-25 06:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1cd982eb3395e7f7898b05316d5c6776 SHA-1: 87e58868e120ad78c71a1642e385e54fcdd89af9 SHA-256: cdd76bde5fd5c5810698c1e1028c6ec3c32c9c8db6b9a96711d09fc346b9bc39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically related to phishing. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://pixomot.ru/uplcv?utm_term=hamstring+pain+after+stretching PDF link annotation
    • http://hydrem.ru/images/file/movedunedu.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cccefcffc8---mobegafewijo.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/nsp0hl6t5i3meohfuetlm2ti43/jajamagegome.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/wobevowemekimasajuzala.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/wuxanagis.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/47997697984.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607f09b38b65e---fugopidemetewujuku.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/gowijalovupesawitunabij.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/95145979264.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16212427080115.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16073e9ee3dc62---wuxonafituvo.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/50424551a39db1578c2759dd5e64c30d/togupa.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/94c3989a6b37651824ac8abbe14d18e0/xavef.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2066c6d41fc3d8182fec4444d3ca095b/46046154280.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/pawozedefufafubaniwoto.pdfIn PDF document text
    • http://ipublicity.cz/data/file/67019794375.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/72407354033.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/174326711.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/fepopewawipapubebopeturu.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f36424c0d02---50172955262.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1234658eb2---fozelumodu.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/84214161329.pdfIn PDF document text
    • https://plasy.com/uploads/file/76045559019.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_off0000f25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25E 16444 bytes
SHA-256: e7ebeeee44afcd8630d4808e058343e7f6c5385aaec558a022082a51aaa4ee6c
font_01_sfnt_off00011ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE5 10752 bytes
SHA-256: 235594f88104b316060b4c762ac42c820596829bc98a0e4e13f416c8749af9e3
font_02_sfnt_off0001355c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1355C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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