Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd5d463b9ef2f6d7…

MALICIOUS

PDF

82.6 KB Created: 2021-09-05 22:12:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 471bcf7576adbd5340b10658b6e9b507 SHA-1: 24cab45b7218232ef53f9ae520d981290308a8c8 SHA-256: fd5d463b9ef2f6d78168a609dd9d4fe525eb36f756de13c770d50b70a4d891de
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories. These links likely lead to further malicious content or phishing sites, leveraging the 'utm_term' parameter for tracking or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=physiology+and+behaviour+of+plants+pdf PDF link annotation
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753f98d1716---321214783.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/c7a90500e54b12c1c085451a37cb03a1/33115197791.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608231778588b---tetezomepokajusa.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/db0cc16e4f55f2ee21ccaa7d99882cda/9388296630.pdfIn PDF document text
    • http://salinahighschool1967.com/clients/c/c9/c9c88be04994199279bceb128c91314f/File/fusevevim.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/36825735230.pdfIn PDF document text
    • http://jfe.hk/userfiles/60653377739.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076b4233c15d---vavubebifezizulojilidur.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210513232914.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b36b8fe2ce9---6967826563.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d9d5ec6bd98---94031421525.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16070c2c665b0e---23091643306.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/75906689422.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/79688245763.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/97796184773.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/pezadikuwoxofebaxuwoz.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/nomubuxofudu.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/nutoxavogabexexovigi.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/baxamererolaroligabilu.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/luselizug.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0bbdadb1d0---xanifafanegun.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/visadipufenefokuxegubu.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_off0000d98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98E 18876 bytes
SHA-256: 5dbebea0f48e4f125eccd08bee49eff196bef4538b63d76495c1518063a46aa8
font_01_sfnt_off00010a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B1 11196 bytes
SHA-256: 92056df293288a3b4b6020b2f8f957a6e5091c150b7bb58b37183380345cc982

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