Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b8724319f18c3d…

MALICIOUS

PDF

83.3 KB Created: 2021-06-17 07:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 69cabfc0f6ad74d46805be0d427ff9db SHA-1: 958874aae18cc95e4e91a85d99f9c1572aa1a85f SHA-256: c2b8724319f18c3d13b2854edc5bf368259642bf3db2dfc464c57aade2dd27e6
164 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of multiple external links, including those pointing to compromised CMS uploads and a link farm with UTM parameters, suggests a phishing or malware distribution attempt. The heuristic for a 'download button' further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/uplcv?utm_term=gta+mods+auto+install PDF link annotation
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9b682c774---gofavod.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/19146949613.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/65219408444.pdfIn PDF document text
    • http://sxhk365.com/uploads/file/%5C/4301831585.pdfIn PDF document text
    • https://isosklo.cz./uploads/wunipukefixojawipesuro.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607194d89d53b---sirodepudisulusonabewaz.pdfIn PDF document text
    • https://capecoralliving.com/media/file/75474228696.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607532e6134f6---98106626978.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160837b1c69d46---peduwaxezadujisejidu.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/97190488838.pdfIn PDF document text
    • http://mousike.it/img_ins/files/77663798038.pdfIn PDF document text
    • http://promador.pl/userfiles/file/wisebugivobapopiken.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bee93174da8---48960890166.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/luvajot.pdfIn PDF document text
    • http://cloverdiamond.com/file/10551301387.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0D 4904 bytes
SHA-256: b6eb2052c487aed5c8e025150a6cf2f59e4b1a9d572def4997e281ddd6b414b0
font_01_sfnt_off00011aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAB 10696 bytes
SHA-256: ba61b00b987fcf78d1d78792dc4c6a35bf2b1e0bd748e1af3f1b648fe4cb8525

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