Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce5793d85b86c868…

MALICIOUS

PDF

125.7 KB Created: 2021-08-12 10:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 9da2356d7fc31b496dfcf5310378743c SHA-1: 6781f89249ab305777607a5f7fe6e15b1b28e026 SHA-256: ce5793d85b86c868dab7fddb8e801f02ba673c5fbc1574ee246401f7209f1b53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/a3eab32b3cadad195465078955e95676/kagovelokilozesow.pdf In PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070873b58ef6---dubefizufunati.pdfIn PDF document text
    • http://meskerjager.nl/media/files/jorulelifadasegafaxipug.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/xojenexoneb.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/pibidopabefunepafek.pdfIn PDF document text
    • https://www.carrentchiengmai.com/files/47006041554.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/41258984501.pdfIn PDF document text
    • http://danielbushreunion.com/clients/41596/File/86281774643.pdfIn PDF document text
    • http://www.ntweac.edu.hk/admin/ckfinder/userfiles/files/71708655360.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/5v041cn97ls2ii6foifq8l3ned/luzituxobamuxeriguma.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-8-10/20210810111759936386.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/5r3egmm83i5a2telia68bbiev1/noguvekakudufo.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/50324839994.pdfIn PDF document text
    • http://ekotronic.eu/files/file/2245213541.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/xijuduvulod.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/da5ccf2f91edd1dc10c3c2ea32d8d038/28762942299.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efbbddeced---bizamevex.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1620651267.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/65950119594.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160896806869e7---lisaluzew.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/20328360446.pdfIn PDF document text
    • https://i3mit.com/shopadmin/upload/files/zugevefoxil.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096bcdd33b7e---45181621904.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/502712c7679c4fcb39292553768de2a8/78916671081.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/rixolonupujanojid.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5956e0559---wobovafavopetimizejupub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=regresion+lineal+ejercicios+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_off00018270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18270 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A82 19712 bytes
SHA-256: febdada3d7fce41679b4b7c2781203487079c0a9a708dabb33db9404aee50566
font_02_sfnt_off0001cdca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CDCA 10872 bytes
SHA-256: 9aa79eebdd6fbad66cee3c4976aebff8940f03aa34fee7e1ac70c918a0efdb5e

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