Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb50d3c33a833ac…

MALICIOUS

PDF

109.9 KB Created: 2021-07-15 11:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6526a876bc0b78f8adf1fe5432cbcc82 SHA-1: b9032b9eba716cd601200e65c9f659a302bba59a SHA-256: fdb50d3c33a833ace8a62af7dc8a5fec7bf28f73784c72729ec8c03e510d06df
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of numerous unknown URLs further supports this, likely serving as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/8e271d732178ade5e2accbd1a1370879/65792643065.pdf
    • https://angkaganjil.com/contents//files/mivuxise.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091d67d8396c---benuritevegoreg.pdf
    • http://mt-filtration.com/uploaded/file/169501070860cfbd4ca712e.pdf
    • https://asset-books.com/userfiles/file/faditijolejamakalunawi.pdf
    • http://sity-luxe.ru/userfiles/file/95382463862.pdf
    • https://gw21.ch/uploads/userfiles/file/26502769129.pdf
    • http://cortabellanews.com/userimages/68461483950.pdf
    • http://sellmysayarah.com/userfiles/files/gumivosudo.pdf
    • https://gulfb2b.com/userfiles/file/34247336396.pdf
    • http://quickvideo.nl/userfiles/file/37951188482.pdf
    • http://zrdb-drogbud.pl/Upload/file/89588864324.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/1f8dc0d5b2d3a3acd05f110de14faf6f/lexumerolawomilizade.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607caef336b2e---8803845909.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/a5hss7hokekk45a7m7hbqoen82/nunafire.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/hsg7fouif9f9cqek88u85kujrh/nogusejusej.pdf
    • https://limsurempat.com/contents//files/61232336822.pdf
    • http://seabeachthailand.com/UserFiles/file/pivamenobezavexu.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b1329a49cad---70375298658.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a71b6a3fb6c---49700288685.pdf
    • https://accuratesearch.com/userfiles/file/11242248495.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed8d469b050---60316253691.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/je1jt3q0omdq48ri7mu6oop4db/60879985293.pdf
    • https://bataretak.com/img/files/file/gikinapevujeniwana.pdf
    • http://mg001.cn/upload_fck/file/2021-5-13/20210513005711926686.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=intermittent+fasting+meaning+in+marathi
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c1e.bin
9428bd952c0ff91df865c58e70fdf21cb060f7ca7923a9d58211b584df4b9254
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1E 10448 bytes
font_01_sfnt_off00014394.bin
4d3964b0fe49ca076b6ae1e62105c481b11a62e97c9ae03a95dddeba4f4a86b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x14394 19492 bytes
font_02_sfnt_off000175ee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x175EE 16792 bytes
font_03_sfnt_off00018dff.bin
af6352c6d9b0e605407c38fa74e817a8d81e4c92f12c4f8e92d0996264b0d156
pdf-font-stream PDF embedded font (sfnt) at offset 0x18DFF 17100 bytes