Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c99c47b3fb69ad0…

MALICIOUS

PDF

83.0 KB Created: 2021-09-14 01:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 1ff32057ea8bfae4ed3d84b3ab28f57c SHA-1: f84a6469982769c0a13efe426bf64aaff2406186 SHA-256: 3c99c47b3fb69ad07d4802edaea068cea4b0c8021ae7c946dfa25ec8f882a16b
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised or disposable domains, indicating a link farm designed to lure users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://mandarinusa.com/userfiles/file/1631541289.pdf In PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/17735801745.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/21945310694.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/93878975350.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/65532621900.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/nakarusakebezopomixi.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/36472692264.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/surememexatagivizovezuni.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/27d5208ca9a74810a1ad2aac33f758c9/70204500299.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/25692064737.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/nenome.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/41337083128.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/f33016160356a3b1d122f67fc33b8e49/ronefiridisufananu.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/96667218463.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/tikadewuvak.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/13882053062.pdfIn PDF document text
    • https://strefaokazji.pl/uploaded/file/72873507299.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/64922335306.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16133f44e27a2a---83069244572.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/f0975e410bbbaf9501e293b4b01c7d26/posokufiguxogimaj.pdfIn PDF document text
    • https://ventsistem-bg.com/userfiles/file/8305790694.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/raleli.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/ritisinotazomusawisab.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/64431990656.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/malufipubo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=5+letter+words+that+start+with+c+and+end+with+ePDF 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_off0000dc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC82 10592 bytes
SHA-256: 35edd97ddafcbeeca937c24d248bfd2cf910776a0991ef767ecf05fadad7cf78
font_01_sfnt_off0000f4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B2 19012 bytes
SHA-256: e90054e5d9f5c7436e604ee1b810c25df4c12e7c2e72cd9ee13c16796aa33ac5
font_02_sfnt_off0001265a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1