Malicious PDF — malware analysis report

Static analysis result for SHA-256 c42aea4336768e84…

MALICIOUS

PDF

80.3 KB Created: 2021-09-20 09:33:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dee3cc50321fe688995995b6bca678a1 SHA-1: 7d10f740c6161bf42cfedda088d3dc79c717346f SHA-256: c42aea4336768e846868b2bc9e0f2e68d9372be21e26b6fea47847b3b492e512
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple websites, many of which appear to be compromised CMS uploads, suggesting a phishing or malware distribution attempt. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ClamAV detection further supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://unite-chem.cn/upload/files/13585480188.pdf In PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/cdb998bd35bbdf46baff7bc755d3adee/81418984339.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/40881697406.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614826784b622---nutonemuvezumimowivin.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/1864707981.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/bukekopimove.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/95468942806.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161463e5fb1e78---27208351644.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/rokugu.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/67395608215.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/koxepofunuzemelatujik.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee20eaf11b---gawubamaxenuzulo.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/kitutexisejagapuwunofom.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/vilixigerugugefufizoz.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/88035227905.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/90251221830.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/28659086070.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/futefigobobigan.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135b0fe9332c---pafujemejurekewis.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/31892873091.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/nebisusekiguwemu.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/92516256886.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/64007257804.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=pentesting+os+for+androidPDF 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_off0000d2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB15 10484 bytes
SHA-256: 60ad145f7f07e91046aed91141f9abd43bd02e9d5a5f62d8ed7ed668902d7eef
font_02_sfnt_off000102dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DC 18824 bytes
SHA-256: 23e7c425227b4e3abe288d5807977a11ea41b1090a8c85faed0066174bbf5215

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