Malicious PDF — malware analysis report

Static analysis result for SHA-256 d76839a05f20877c…

MALICIOUS

PDF

76.7 KB Created: 2021-09-22 15:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 897620b81a59029e51ac845cede115e1 SHA-1: 5d9a8ba59b5a0c0387419ec084ae991700f57c9e SHA-256: d76839a05f20877ca89e2ad01c86927d20f79b83d3a92fd3fc3a10e9177f1087
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to lead users to potentially malicious content. ClamAV and ML classifiers have identified this PDF as malicious, likely a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://infrive.ru/uplcv?utm_term=logo+quiz+ultimate+guessing+game PDF link annotation
    • http://japanbizkorea.com/userData/ebizro_board/file/gajesekikibopoposirige.pdfIn PDF document text
    • https://netpage.info/userfiles/file/zegaputapifuvofexuk.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161490ffa5caf2---9262482313.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/99141547916.pdfIn PDF document text
    • http://etkenkalip.com/files/11321725351.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/mewaranexozugefitif.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/kofasabudovexopepevug.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/40986204937.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146e2b5b4343---13152544711.pdfIn PDF document text
    • http://podushka.by/files/files/musoxowubizajixa.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210917_358F47BE7F42241C.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/gawujupewexu.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/dedexuxefemami.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/togorikejuva.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/petulifulebebovejunaji.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///99717488415.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/sumedoxomonetojiz.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/zemolap.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/20219111627324568.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f60cd30237---risiritalogimolige.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/98614828290.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/50443126544.pdfIn PDF document text
    • http://airfa.it/userfiles/file/midibavopapular.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/puboloj.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_off0000c873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC873 10616 bytes
SHA-256: 39df47bca8b2fdf089f1823f64b9997e5098bef20261c22b6537a475a3bb093d
font_01_sfnt_off0000e06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87F 17612 bytes
SHA-256: 3e6832f569827ee0414cde1d7dcb498f8e926179b554bbf0b8bd4a02fedcb525

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