Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c71a770b078c271…

MALICIOUS

PDF

87.1 KB Created: 2021-10-06 23:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8403d3bf0f8980f6035269bbe60a150b SHA-1: e75df5d1759d314a9b417a1fadf0fa32ca0efad7 SHA-256: 4c71a770b078c271c07161d56dbe526b613a1db2ad8fd4032c324377c594817c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous unknown URLs suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://tuvantindat.com/uploads/2021-10-04/images/files/buwapojofidukit.pdf In PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5973ef274---totepetavobim.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/luzogidipusun.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/fizuvelaveb.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/koxupowojipanojagezowavo.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/sisojeto.pdfIn PDF document text
    • http://forti.in/userfiles/file/vozojimibop.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/45952059699.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615d202374b8e---15900425345.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/mefimujogo.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/mozunedewusomiduvedeka.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/mudekuradusire.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/2136007300.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/2becda44bc78b4a285a9cf630841e363.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/mojemalus.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/40469206079.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/keremefiwew.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/vabafizuwokalex.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614309d436069---wukekirinuw.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/kigilazikodojevudire.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16152dd304c9c8---29065396662.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/0a8881716863c94dce009cf5be342012/22666449305.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=5+similes+and+5+metaphorsPDF 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_off0000ee03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001061a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061A 10696 bytes
SHA-256: 10761e71e8ce627acb725d97af1cfae7dbfdf0f4f875070e2fde62c4770c10ec
font_02_sfnt_off00011e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5C 18964 bytes
SHA-256: 1989a15a6eafbdc01cbc1c7f91b6077a73b6c62f5f1e2f208d4ccd2631cd6667

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