Malicious PDF — malware analysis report

Static analysis result for SHA-256 291beeb6922a2717…

MALICIOUS

PDF

82.0 KB Created: 2021-09-10 13:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4755337e35361ad7c4945f38989171d5 SHA-1: 5e57662d96a62486b2f08f3b408348ac24205392 SHA-256: 291beeb6922a27176c6975ce970fd9018298fe496daed8a48e4de72f52cec852
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://geniodelweb.com/file/59536693616.pdf In PDF document text
    • https://koratspring.com/upload/file/parawuvu.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/zutitigimekewekavojew.pdfIn PDF document text
    • http://zaiger.ru/img/file/manutufilobozozo.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/xowozew.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/vevuwifilafawoponisuxuz.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/fubibabiwatusub.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/derar.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/37887565652.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/gomewosagur.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/duvejoxuvoduloxerexapudo.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/e18bacc45ed668e00f331c88918c1a85/torof.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/99456618385.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1631166916HgGh.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/51750690747.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16139057434286---7872104260.pdfIn PDF document text
    • http://bulmarconsult.com/files/zafojexegepavusifi.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/7442646487.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/91844614706.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/rinukepubedadoxu.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/72594938687.pdfIn PDF document text
    • http://classtool.info/upload/files/xadikokefokawareli.pdfIn PDF document text
    • https://tipresentoio.it/images/file/sujezowuzetukudosov.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa364ad9a1---waginuzonisanebewopep.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/fumuzatowisusomebitubuxek.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/75439345405.pdfIn PDF document text
    • https://bagstyle.uz/images/file/89170346048.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=ielts+general+reading+practice+test+with+answers+pdf+2021PDF 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_off0000dc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF443 11108 bytes
SHA-256: 187e31151724123824f52ecce0c60bc68ebb4e5826e806fca28f225aea34b50b
font_02_sfnt_off00010e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0C 16864 bytes
SHA-256: abf5c277607ed0e351fea8c05c59fbd46364092acf37e83f90f18ba28637913d

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