Malicious PDF — malware analysis report

Static analysis result for SHA-256 b85bb54b57b2120e…

MALICIOUS

PDF

70.7 KB Created: 2021-09-08 18:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: f2878156e9993ceef4205d60f4823b1e SHA-1: 53abbd81db89e7457d4bb005a82986d07ac514d0 SHA-256: b85bb54b57b2120e2e74691a6778a50650f95b85fb2ffa681843b166708ec81c
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, with several heuristics indicating a compromised CMS upload or disposable hosting. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent, likely to lure users to phishing sites or download further malware. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6770

Heuristics 5

  • 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
  • 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.pelicanfinancialnetwork.com/ckfinder/userfiles/files/mebatuxelewurewikifavuveb.pdf In PDF document text
    • https://pottoka.info/files/galeria/files/24449466959.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/18652200789.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/dazurogawasitalop.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/23386824814.pdfIn PDF document text
    • http://393citizen.com/upload/files/64041362934.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/430489858.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1612f09c4d4411---kidanenepi.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/gidodobugep.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/netogidarafopikofowikoduk.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/5463938913.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16135f558ddef8---fezezasokexoneb.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/56112997517.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/vilukitawipogofonov.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/41146532283.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/vavupi.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/fivimafevogotigoru.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/13831732131.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/58915798659.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-5/20210905192223362329.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/jazubolapofoxevesumoz.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/baccd263fc90b7dd1fa987a987f21ca4/85379536620.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/39387559630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=partidos+politicos+definicion+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F4 19220 bytes
SHA-256: 0b0d3a3783a9041d1e6fd201595c3b0efd880ca853fe9ef9ed1945f3e32c0a26

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