Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd710451832b8847…

MALICIOUS

PDF

79.9 KB Created: 2021-09-06 01:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 60f46b7decf92ba29e5bcf0c1c8b408a SHA-1: 3c5064dc17a7d2808f72a521c6df6dfecbb07678 SHA-256: bd710451832b8847c5595e76e4155895d49db5840281018712d9777e4ed9e63c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160873611e34ae---lorajixasugew.pdf In PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da4ff6a05f---86715368801.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/3870750015.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16126b04166072---runelamumivefagawuduf.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/bkp5p64i36hdpsc3j858q48sp2/40433679572.pdfIn PDF document text
    • https://nada70.org/userfiles/file/wemivuzinabilepo.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/bezexafipo.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/gividom.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/i33qjovmhln1513fsqk44300o4/jelivex.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/8544325361.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/43017420313.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e65ddc852---64988646100.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/fawutotenijen.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/32534167797.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/30122398347.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160aa211ebc687---97150975346.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/50335145987.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ded81b0307---99955882712.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/63417136780.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/wugelerezet.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/wovafanagefifejojeb.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/s37120en16m63fato8rhiu1fov/dumejevematub.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/6132894873.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=formal+letter+template+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_off0000d94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94F 16052 bytes
SHA-256: 1ccd7308f6c4fb9ef5b12dd9563af9045ad2341e24daca3528cf71f59420f9fa
font_01_sfnt_off000102a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A7 10272 bytes
SHA-256: a2de31921e40c258215ac6d1d0eaf53b8e15536292fb85059b2f4134507f991f
font_02_sfnt_off000119c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1