Malicious PDF — malware analysis report

Static analysis result for SHA-256 be0971c6b3c8cde7…

MALICIOUS

PDF

84.6 KB Created: 2021-08-17 14:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f360dec250b11f1d0f03755f790b6d29 SHA-1: 4ff84681df060886615d8317c91bfcd2d8918689 SHA-256: be0971c6b3c8cde717ad06b734fd5f19a480fbdb9b9af4c769c8508d23b483d6
156 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of these links indicates an attempt to redirect the user to malicious content, likely exploiting a PDF vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 http://clingac.es/d/files/8473746903.pdf In PDF document text
    • http://giustizianuova.it/userfiles/file/lobidewafagoradexa.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160fac3c43c72b---91558983896.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf9e0c0562---61593685719.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a0004122152---zenopupesurewokegepo.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608041acefd5f---vibagexuwafad.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-7-8/20210708124721230908.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4cc5ae422---fitaw.pdfIn PDF document text
    • https://nasikampung.info/contents//files/44822413447.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/subitigam.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210525190042397526djy286.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/8116750462.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fff29af72a---wedarenokogedelurira.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6bf852c52---padelewubu.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/gilofebisejabetomener.pdfIn PDF document text
    • https://soechi.net/userfiles/file/88359149990.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/55558375046.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160746bfc67ed6---32458387359.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765f7a05e85---15657438336.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/rafinudezulibobutu.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/dopuzujelamasexaxuzodeje.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/62436872275.pdfIn PDF document text
    • http://fygl.net/uploads/file/270301171421.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/fuvutabujuxoz.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a155f15033b---nanokamumukulajokusolok.pdfIn PDF document text
    • http://dienmattroigiasi.com/uploads/files/jigomubexoterame.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=ejercicios+celula+animal+y+vegetal+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_off0000e283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9A 11356 bytes
SHA-256: 334c9a7baf06867703633ccde9218e7b4fbb30c03ffa1015b2d8accb049954d1
font_02_sfnt_off00011517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11517 17584 bytes
SHA-256: 4c4a9e592da2436fafcf5bacc949c1c60dddd6347beea0b7a9286ff8a0a09ac9

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