Malicious PDF — malware analysis report

Static analysis result for SHA-256 a618f634790edcb9…

MALICIOUS

PDF

92.6 KB Created: 2021-07-21 16:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 63d45e49fcff0b591d3d6c7b865ebd82 SHA-1: 25a4e80c08e8327b7c5242a94b52e5ec8dba48ac SHA-256: a618f634790edcb911ca90eef59c651557c92cfaa64eb75b3b81f6e4fc782d14
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many of which point to compromised WordPress sites. The document body is unreadable, but the heuristic firings indicate a link farm designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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 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.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b34735ece---95680338143.pdf In PDF document text
    • http://doo-san.com/userfiles/file/20210706223721.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ee59c42c620---74295834300.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/2893354267.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b883cd4ff4f---34074220217.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e606474483---pugixew.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/f0aa753e999b1fc33a038537e698d076/47684140456.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/7j8e7doevsutbo9geplhtcobj8/79262934922.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/a215bf95785119a04179adb0cfdd38d7/votaberafurubukexedusu.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/30293546038.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/06652363e74bb7ab4f53b7335b0b931a/robil.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/45775839550.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c5e398afc---bibigatole.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073e74b0493a---xovuseresixodenugo.pdfIn PDF document text
    • http://malverne69.com/clients/a/a7/a743c233813d1a1dbf5c38c484d85cdc/File/62160242626.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/gigafimajubefake.pdfIn PDF document text
    • https://sambelteri.com/contents//files/xogagaxividemebokef.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e04d078e44---furepirogamajevupujas.pdfIn PDF document text
    • https://bio86.net/fichiers/4151361378.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/f8cfdd28e1855e45cfc37302e8c2eb65/luxafujeziluzisokerefimo.pdfIn PDF document text
    • https://airbays.com/userfiles/file/tidofepafolinemez.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/lewimemasarutukilepo.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798a90315c1---73806386552.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/54405757309.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=eclipse+user+manualPDF 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_off00010581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10581 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D93 17760 bytes
SHA-256: 8c5c6a7679854053a0baeaceab9957bf032bfa325edee8ec893f387ef9268b76
font_02_sfnt_off00014bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BD4 10400 bytes
SHA-256: af774bf456c0f6080d0f06d37dcdc03083b4a3f0d68f59231c490cf7ae2c69a5