Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd67bc5f35408f01…

MALICIOUS

PDF

84.5 KB Created: 2021-08-29 13:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3f4fe221526583de367152a8a3c7ba52 SHA-1: e9af5bdef04363502c8e47f6bc396cf4e212db80 SHA-256: fd67bc5f35408f013ddca491234864d1209d2729a657f20a9f3c1df7f7b237b3
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external PDFs hosted on compromised WordPress sites and disposable domains, suggesting a phishing or credential harvesting campaign. The presence of a 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates that the document may be instructing users to open a password-protected archive, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://z-sinpro.com/upload/files/97653941233.pdf In PDF document text
    • http://ottotech.center/userfiles/file/29910613647.pdfIn PDF document text
    • http://liily.jp/upload/file/20210725122844.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/45831807117.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/xisoxi.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/9566772444.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/96e7fcb8ff8bd3c9eb877c5cacd313e9/73785222323.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/be710b4d68531f57c7e72b7541c2a37f/girari.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/7306695908.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608226e13e0c3---1904495955.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/56211701404ea652318f47853bc714af/nanujigenad.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160c88a4417208---zalokuzamologevisalok.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb7c6df769---49480760400.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860b65345f2---feminof.pdfIn PDF document text
    • https://namlongadc.com/uploads/news/files/powokawedupumizasazevake.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/67969763905.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210527092602.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/7a9d94c8fe21931ca7514b9807da8f6c/tufimapesixenev.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efea17b03c4---42035381247.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b95cda322---lumokupoxujetexu.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/c574ljnk7jm8ocld5vb2pp5ofh/faxujine.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/5100100150.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16079b7e3a5cb0---dirovisax.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/79692979839.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/64486996550.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf450225a2---gatinam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=unprotecting+an+excel+sheetPDF 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_off0000e254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE254 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6B 10760 bytes
SHA-256: c65da92dc50efae8437dc977f5818ee6eaa3a181f4f5f8943ceef0dd893d314c
font_02_sfnt_off0001131d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131D 18756 bytes
SHA-256: 31f18dad3628b7c4a3cf80b8af8532d68413e50bfbd4641c2b6c41252a6ef515

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