Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f83724703fb1d23…

MALICIOUS

PDF

81.7 KB Created: 2021-09-06 18:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 18c09a5553633b361eef753ba3efa019 SHA-1: 92a71a6200e31a12a119be2288f9b933865b7f73 SHA-256: 8f83724703fb1d23e999fa6f17feb59d4a67a969ffe55d2eecfa37f0fbc5e08e
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to numerous external URLs hosted on compromised CMS uploads and disposable domains. The primary purpose appears to be to facilitate phishing attacks or distribute further malware by leveraging these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://archism.ru/uplcv?utm_term=read+out+loud+pdf+online+free PDF link annotation
    • http://csc025.com/userfiles/file/20210819133116_sjo49s.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/888568176e8bf2bf50c5cc613ccbd0e1/wepexorogokaloze.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/51328147584.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/51aac4a21c5554e1937fc14e387ce2fb/13998567219.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16075ee3b3df2a---87980334256.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/15300587596.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a546754804c---vofumedo.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/tj00r3g7d7qnb5g5tahbl0l568/xapiponedito.pdfIn PDF document text
    • http://www.heksan.com.pl/file/kegimatijeruvakevat.pdfIn PDF document text
    • http://wernitznigg.at/files/faritudetizaboput.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/b5p24pi93clv5igute24fu7cp7/zilunizetinibikure.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/natibovotiv.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/jenibaf.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f4c1c6431---fomodurole.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/lamelat.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/44049974975.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/dusarudos.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/6853699725.pdfIn PDF document text
    • http://gaineyranchaz.com/userimages/dakeluj.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/99ad46f371c0d376c5256548dc13bfdc/ropotuzeg.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/gajikapojuxetatabuzesagi.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/76236128584.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/98027087247.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_off0000da7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7D 10468 bytes
SHA-256: ace952a0cab433d496b4f79c941c853ab9bfb061ea64b5b070d9d7f5f135dd52
font_01_sfnt_off0000f24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24F 17884 bytes
SHA-256: 22fe43aacf1651d6fc291310e79c0f0e6a6c4a870817bd1b6a748c059a0195d8
font_02_sfnt_off00012102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12102 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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