Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b4022e43e2b807…

MALICIOUS

PDF

75.6 KB Created: 2021-09-18 08:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 38ac22b429385defe3f8f2ffb835f666 SHA-1: fc480b0fb8c0b8df58abb2a2313ee1e6a25b39e4 SHA-256: 23b4022e43e2b807d0bf0945334b88c8a23abd3ba04b64f69939bee8d79464ac
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or conduct phishing. The document body is unreadable, but the presence of link farms and the overall detection profile strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/kirasiwubukulalefejadumuf.pdf In PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613df7c94fa6f---48269981396.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/4ic8hhh2jps54kakhf2kg6gifv/sixonobuf.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/10931612502.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d0c47e3b8---zubogokapibukanigalazuru.pdfIn PDF document text
    • https://j26clean.com/upload/files/4948437645.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/34771125309.pdfIn PDF document text
    • http://laserinnsbruck.com/static/61684940212.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-9-14/20210914114507779064.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/161356bc0af275---4508585998.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161453dea8eae6---gozanisakumapajuxanes.pdfIn PDF document text
    • http://toonesk.com/upload/48836400229.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16131fae8c7d04---gufaxomeganikafokoviwuwot.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/32188001621.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614197275b8f0---petavametirobepovupof.pdfIn PDF document text
    • https://cncunse.com/d/files/xawujoluvokudevow.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/kikelaxemadifikapelof.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/segodemunelekaz.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/97369653677.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/65324026449.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=paranoid+android+windows+10+themesPDF 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_off0000b98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB98F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A6 10728 bytes
SHA-256: 656ff419d0511b6374803a4082f5571ace74ec8f7167e39e1ff1764f911c48a8
font_02_sfnt_off0000ea2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2D 21908 bytes
SHA-256: 5c95cecc9a89f1c93603773188c0e065adadd3be00a7a2ddcadfc9b2125405ba

Open this report in the interactive analyzer, or submit your own file for analysis.