Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ccc96c8fc85af86…

MALICIOUS

PDF

78.1 KB Created: 2021-09-22 15:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 13f0a1cf5b55c32d5e8ea38b094dabc7 SHA-1: 8aacd5ec7bfa18cf4e730412bc2e5d25d56a456f SHA-256: 9ccc96c8fc85af862a57f9acda3a1497f50e9f5cfd848f956a3e83eb47d050a2
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external sites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • 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://pistant.ru/uplcv?utm_term=powerpoint+to+pdf+converter+free PDF link annotation
    • http://veoguidecostarica.com/ci/userfiles/files/54878845677.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/ccc36e28eb9701689759b79dde2d7ed8/18812826692.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/63ml5mo5h14q462dl4g5807e8h/1176104504.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210916105746.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148cea5ab3b3---97499804287.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/55674380492.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/86030952848.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/redovabelebup.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/gidikijipasovasozepa.pdfIn PDF document text
    • http://synphabase.ch/upload/file/bijolovenoluwatilojif.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e35d9de008---12071865860.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/80492086837.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/67707111690.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/faff54ddeb1625399ed38c9e6e5949ae/rudixosunosufaxuj.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/sejagulinuranizadejirut.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/6679333039.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/76782303564.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/vimukotipajegukep.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/41950593049.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613434a52bceb---dujusupuf.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/nafolaxapawilawuxenokog.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/8543860918.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/jesagun.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_off0000cd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD65 17672 bytes
SHA-256: 65e1054389a0cb777e5eddd63a6e89375666eb2c50fd188bf5c671507dc92693
font_01_sfnt_off0000facc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACC 10388 bytes
SHA-256: 0a8da79abfa17f2d567fadde1ee2e4d79aa223ffe5b6c7e652b35a275c46be11
font_02_sfnt_off00011275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11275 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1