Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c52b985e2b4924d…

MALICIOUS

PDF

82.4 KB Created: 2021-09-06 01:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 69575e5999c751affa447874e86db5e3 SHA-1: ce9a3ae338271faf9b878aa6d903bc11c2c9e364 SHA-256: 6c52b985e2b4924df610993c71421b84bf4d155417abde11c6c851a422979939
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were extracted, the structure and URL patterns are strongly indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://etasystem.net/userfiles/files/lajimukum.pdf In PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/htuoncsgm03n5vln4a2ur1s0md/jilewusodepo.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/fidojuwovexutuxelopomo.pdfIn PDF document text
    • http://capableapp.com/uploads/files/59449685184.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210822092212334.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/tarexamugixikoxorodaji.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/12333714225.pdfIn PDF document text
    • http://noithatmfc.com/media/ftp/file/rosuje.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/3b3d28b856afb5b2889e96be817f437c/dikexefowofen.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5deb30303---vogepulazajewi.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b2c813468---devixezoritumabezezaxi.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/29573413681.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/11558834300.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754836d0b9a---likejajajewonaxen.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/ig9g3osh3gn0nutgoq63c54ss5/58645175329.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/nofugizexisopewaf.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/33494145284.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/4326988655.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b777d0a6d---tutakexav.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/f1df0538852607f6a342de0312a21b84/42607012030.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/gut1sp44ncj2772nderodlgphn/tetatizisesuno.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abe2bee589c---6490529755.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/luzivukenegitijugaw.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16082b8bb3cd96---sosuvusavabefulolavixovum.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ddd4533e6aa---bolofiwijimusomuwupot.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/p3esmacrmgkgu61enqurp57g6t/29147593972.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=emotional+intelligence+2.0+dalai+lama+pdfPDF 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_off0000dc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46C 10984 bytes
SHA-256: ea8a092cf05c92e85b337dd72ffeb6db3e93db22b1d0b8f8e4e4fd4ef8339fd4
font_02_sfnt_off00010db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB2 17884 bytes
SHA-256: 18b8b4c768ceda69b47f2f08cbdb10040e06b2beca670d25640ff730e2d6f193

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