Malicious PDF — malware analysis report

Static analysis result for SHA-256 b80c86f0327d9629…

MALICIOUS

PDF

107.4 KB Created: 2021-06-26 11:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 261f6214518a2c9e3b19362cc033cc51 SHA-1: 8b1d058cb362a49dbbd5edfa3341e83752138241 SHA-256: b80c86f0327d9629339acc50c51209812116518ae23b028c7aad2020291b330a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs pointing to compromised websites, likely intended to lure users into phishing scams or malware downloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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://drafthe.ru/uplcv?utm_term=what+to+do+with+ghast+tear+in+minecraft
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/9aeb3639d61eb7371d1605e62b29f9bc/sopalogagesatazopixomepi.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/58g166986oht1f4v5vfv85lsbr/20384258137.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/27b809f0f40f18a70e459630c2ef3ea8/xexekajebofu.pdf
    • http://insureacompany.com/userfiles/file/giwusiwegomofixitadasama.pdf
    • http://orosweb.hu/ckfinder/userfiles/files/2686399907.pdf
    • http://thsport.dk/ckfinder/userfiles/files/senurekun.pdf
    • https://gachbinhduong.com/upload/file/pipek.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/a58e7fc5b4631c73a56a5971392742fe/35782730692.pdf
    • http://jjmcp.jp/userfiles/Image/file/luzal.pdf
    • http://pileshoppen.dk/userfiles/file/sawigod.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607565998e994---duxazolunaratosebuvowi.pdf
    • http://aldara-latinoamerica.com/userfiles/file/92419949062.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077bad4d5eb2---datuvuvebipatufup.pdf
    • http://chongthamnguoc.vn/img/files/bewoginidukezuliben.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ee81d041e---91607196407.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/9rctddu5qko7ni9o5aq4r8co5d/jofoduxid.pdf
    • http://argyleliquidations.com/userfiles/files/vojitaxukiwenerevibi.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f45a2830c---bejikinimudunutemobowim.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22fced94c7---43473046089.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/a446e3cdf69747a4403d40bf0fd20df1/bikomuwujizosesop.pdf
    • http://dok-vo.ru/userfiles/file/tadejokosapew.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9863a9f49d---37494849164.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bdad5d58a---67237085845.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16096261e4a154---wikewalolejezejulivawone.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a574711101---65059521882.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943668e977a---68417083686.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013f49.bin
1004669db3b5c53b7d3293eec3e0f5c31c24af5b8db8eb4424221449e5b6ba59
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F49 10956 bytes
font_01_sfnt_off00015867.bin
16420232e6212b31cc93f5080b5cfb65cd8352c839f440a55adc54c663ef7fb4
pdf-font-stream PDF embedded font (sfnt) at offset 0x15867 18056 bytes
font_02_sfnt_off00018804.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18804 16792 bytes