Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc697f746f4c3be…

MALICIOUS

PDF

74.4 KB Created: 2021-09-02 13:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c23d41f2c6c41aebf17fdeeb74562f2f SHA-1: 3b041b08187cf19e40f52b81716f039a2652e456 SHA-256: 7dc697f746f4c3be0ec88e17dce5d50af254ef558abc49a5c4bd9e95dd761216
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting an attempt to redirect users to malicious content. The presence of a link farm on disposable hosting further supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/rsguk239ouj4t1n1s91cshflpc/nuxidaguravowe.pdf In PDF document text
    • http://cn-junsheng.com/upload/file///2021731016651.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gibimuvofedanitedomazizub.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/30285920495.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1ee068083---funifowive.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/d25c9d064344fbb9feb96c1637d252b8/dedatamakekivovixesavalu.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/fdc15831de3b749c6283c791a9fb6469/98809416320.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/4339c754b96b7787eae053e6835108d0/baxaruramesevop.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/ligozewunelapa.pdfIn PDF document text
    • http://calliopegoodrich.com/clients/73417/File/fotopopuzaxufopowusisubom.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/2gdpbg3s411bbmi11hb6r2lju5/jigidovinorinosij.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/notatet.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/11206851877.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210512065951.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/rewelodepabaj.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/lopiwapi.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160ac17c5b1591---vofuzapif.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/59582009075.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/zikezenewileg.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/77498377256.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/21726685227.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/73c398b4a8cdc51f80770df7b254b996/depabasomerewududanixoxus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=botanica+general+pdf+libroPDF 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_off0000bb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB93 18352 bytes
SHA-256: 74a48a63ebc44e92503604c26dd5d31ce6337fc339181c74ae9a77e3e3b412ac
font_01_sfnt_off0000eb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10343 10820 bytes
SHA-256: 03a963a366cc014583c32a387e93675aa8a63c61648c24a7b8ac4a57d36a94c5

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