Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf900a2971a5b787…

MALICIOUS

PDF

77.0 KB Created: 2021-09-08 11:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a0628c969ddf29b7d8168bcb93bd6e80 SHA-1: cc1bd57a7649495effc017c75297ff66d5cb9c81 SHA-256: bf900a2971a5b7874b54b03f12a704aa939126e60d7b6ded2fa8f24bc7af6c09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to compromised WordPress upload storage and disposable hosting sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=mackie+16+channel+mixer+manual PDF link annotation
    • http://vaness-sens.fr/ckfinder/userfiles/files/xerigirilimigum.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/76563649929.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/fitalavogenawe.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/surenetidetopil.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608d50fd6ef29---63514258651.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/lorowebiranabubitexa.pdfIn PDF document text
    • https://tepihtrava.rs//files/64431813900.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/59796982365.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/zunasuximi.pdfIn PDF document text
    • https://securitydm.com/slicice/file/jozinuraxezimodexata.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/jurusikekerinedula.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/mugesutewurabajad.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/88731425241.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/megukipobusuwetebuwozol.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/kazijo.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/guginesenudatosijuzone.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161338f478a7f5---polasirijumoli.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7dd09c674---81934793937.pdfIn PDF document text
    • https://windsbs.biz/files/file/23898984568.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/nekuzibow.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/f4bf19b05d1026f57706f07832f96038/33002176279.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/133cf12bf87e769f4749692c32333afc/72161864946.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608789c213c68---xazasolowolategisowetuta.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_off0000c902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC902 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE119 10616 bytes
SHA-256: 18a6f0c541435cf3b2c3b03186c15eaa25073281338fed9f16fb8126a35b83f5
font_02_sfnt_off0000f928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF928 17580 bytes
SHA-256: a9db44cb0e2e0b3070aa864fa7d394e8640b9c79eb8486d273f0751c265fe463

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