Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c6643ce89d885fa…

MALICIOUS

PDF

96.4 KB Created: 2021-09-02 17:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 78c07ef7fbed1e1507d183633018f7db SHA-1: 2210fa6c07ee692f0e6db084bb7f17327d76885f SHA-256: 9c6643ce89d885fa6670f089d2f421423f91f9546a78a6ad7ee4e4fa34f03a6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF structure itself is not directly indicative of malicious intent, but the presence of external links and the high ML score strongly suggest a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://ketchas.ru/uplcv?utm_term=capacitance+of+cylindrical+capacitor+pdf PDF link annotation
    • http://ttfi.org/app/webroot/userfiles/file/gudotubadisaxibibesadewe.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/28786048838.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/vewonusizamavusovedivutat.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160b957e47427b---90027501748.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/bbe915d3331d4b943dbef98ee2b11380/suwufuxewatobalomejedo.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f57338f17a---kexivexiranejinifagirik.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/848218e4221ac14c793656a7e1af291f/ziduwoviwapinixed.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/2424d453bbc8ea1d592c19a28f681be0/ruwejamufosogutol.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/4833c236274e31ad37d7f5608b7d074c/bedubisodevebujarilikoriw.pdfIn PDF document text
    • http://garderoba.sk/images/_file/sipekomasuxot.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/abac6cf09ae8a8d885529af329658c12/18701562683.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/se7dicl1fn0flt48cgd6avd242/98623232833.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/bugabevopiguwase.pdfIn PDF document text
    • https://activepymes.com/pub/file/55711840246.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609860c042e24---68073642585.pdfIn PDF document text
    • http://wchs67.com/clients/f/fd/fd50fd9748f3592dabdfdad26f378f15/File/lezeweribikepajit.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/29775584943.pdfIn PDF document text
    • http://lmyc.net/clients/875386/File/buxukegosule.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/3no034pj0p2e70c0r9nmu25ro9/lunukarobaxabagor.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/upujttvnetj223fd982avmgts0/33823695018.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/723f068d79b502cf01df9cf52beff081/lirurunirexasuga.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/joferizoduxo.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/d0a2253c17642ab7288f0e3694637bef/rigekazanuxode.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/fc75285dba5fc0cbd9a010d352383dc6/velalevadifumesituninisij.pdfIn PDF document text
    • https://unicornccc.com/ckfinder/userfiles/files/36727239360.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_off0001161e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E35 10592 bytes
SHA-256: 783fd810296f98413c52b992b3aa46cc376f82bcfcadf07075f5b99785790653
font_02_sfnt_off00014688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14688 17284 bytes
SHA-256: fac5fb9b2fce78f6a5c1fb9b82e20ad7b61e613055132c92433054288bdd3de2

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