Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b79768406ca995…

MALICIOUS

PDF

89.4 KB Created: 2021-08-06 17:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1bc4b9d04399c4d19ad36a7629f498a0 SHA-1: 947ebf4f5a1ae6f8fbbed07478718bfe558c3ff1 SHA-256: 85b79768406ca99526b307280642d91c9e727178fb8194c461d2b56e4e06ac87
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the nature of the heuristics indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://drafthe.ru/uplcv?utm_term=casio+g-shock+ga100-1a1+review PDF link annotation
    • http://oreade-breche.fr/userfiles/file/xezarefiramekasal.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfe079de78---gavuxisidonulu.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756ecdf3c7b---75030046231.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/331dce59576973931a6a3a2549ac454f/74437344755.pdfIn PDF document text
    • http://shosholoza.de/file/10397290219.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/9ec049269a9c47697efa822ee40393aa/11298903604.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610caaf59b43c---10435664246.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/petitusimusegajobaxo.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5723202ec---simozafezajekunemotabi.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/32946198990.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607668ea4f824---garijopuritakifo.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/86823213989.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/37917101742.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a655610422---57492582410.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/43552426260.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/d38519058a42016cb873ba1ef30baed2/72613554169.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/16516385048.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210622_151212.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/diletapisogiw.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac94fd8fd0c---tugimupelugub.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/391a5d3dcedb6da2fe3e56991ef2c1cb/45730307051.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/65b043fb96b7d0437828c2fb413800b6/jumuzi.pdfIn 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://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_off0000f8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F3 17224 bytes
SHA-256: fc9b40c50f925cd2e911fb50620843c1f2893e9cbd7ab20a58b3b4d84537f313
font_01_sfnt_off00012627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12627 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E3E 10744 bytes
SHA-256: d8fe920cb1969705f751636441b16ced36ef56edc2d931fbd3442d760ca2bf49

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