Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f01c3f9c5852fe…

MALICIOUS

PDF

82.0 KB Created: 2021-10-08 15:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4b8cd2863ab6fdeadf744eba02120beb SHA-1: a19d9a1da66d2becc553edec0782ebeb033a15e2 SHA-256: 51f01c3f9c5852fe20ed303199ed658c00c4c1cbcd3561f88d6b668aa7edde45
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3497

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 http://jfe.hk/userfiles/79713705882.pdf In PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jedokatav.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/54174920957.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/xupakapejalupunodoro.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/70034283921.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/18430734463.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/mogudil.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/28062392939.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b227204d1e---6473973772.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/kabimokudozo.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/fatopesa.pdfIn PDF document text
    • https://12shio3.com/contents/files/68257485690.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/90410214590.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2ffa6437f---98532012970.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/minin.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/19593719878.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/nimabifoluraxosobug.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/suvinujoxurepanad.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/69ab4531ee63dea40cbec6bd1b205241/wowoj.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/melimutokek.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615f4f1924e1b---2831147815.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/24341395770.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130d7cf1f5b2---1106155787.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/48911254097.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=student+discount+cardPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001051d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051D 19004 bytes
SHA-256: 2c4b825adf75b3f74e5b5dbf640f03f0a23eaeb3c89a3cba165302a9f2448102

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