Malicious PDF — malware analysis report

Static analysis result for SHA-256 72de8b4581fc2adf…

MALICIOUS

PDF

140.8 KB Created: 2021-07-01 20:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e476c7a8c89aa40135e04e8fdbb96be5 SHA-1: 4125c75d0abf2325104353e06e12e1d25bb25c8d SHA-256: 72de8b4581fc2adf844d5a2b347515d633653c52d5664508d3fe724847297028
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting an attempt to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious link farm.

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://queure.ru/uplcv?utm_term=universal+reconciliation+heresy PDF link annotation
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a77d96cb4---kusovakesufipimaz.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16089cb97334dd---97281436204.pdfIn PDF document text
    • http://nbpcpentecostalchurch.com/clients/65183/File/12525961248.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ef04715bf---41376390332.pdfIn PDF document text
    • http://cmtsport.com/pliki/90754324547.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/kpn1bofrq5pjq66hf6ki2ju9bu/dudusezogiwumon.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e13c850a3b---lonevolazazoxon.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/kjjbil78dh16lk8keh3jmia7dc/tebofagenepivosij.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/vadubakawizam.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/274977395e9c2eb0187b3199bd1e01db/80088332325.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/98111791167.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9f31330c2---karodizufituzilepafunes.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160764b9eb616c---40922029601.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/5f394c36489d1e2edd7dcaae2218aa17/katazox.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/letirulusakodawumuj.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/2vfm73ku04s4io1hl4ip9agfv4/89610219401.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/6e7986926019c0b00baf178f71a1b067/xuxikav.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/599ef674374526ecf1cdc472a0f159aa/rifidagal.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/u9fbthecqqmkp9kc75gj130meu/zovesomovukozisomivesom.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_off0001c75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C75E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001df75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF75 10516 bytes
SHA-256: 6d40549d89c1cd122b774238a38bbf137b5311b4251da4c1e9157d87f206799f
font_02_sfnt_off0001f768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F768 17720 bytes
SHA-256: ddd14c9edf2565f96d9ccf9daf19be189629942e5feb1871e9087462eaacf0be

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