Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f867e3cb76ee214…

MALICIOUS

PDF

78.9 KB Created: 2021-09-20 15:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 14f87753a5ea1aa0bebdb6e087702b3f SHA-1: 02e9cf823d60a53562048d35ca00bb4b7421bd31 SHA-256: 3f867e3cb76ee214c1db17497451f5ea91e92e090a50568aa6630f48b54f6b91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://cmcthailand.com/ckfinder/userfiles/files/fixuletogo.pdf In PDF document text
    • http://ativn.com/upload/file/xugewozimagoraxekifo.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/vagovegutukojenerawi.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613792877277c---bopabo.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/97345797210.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145ca1058dc5---loteniludugivadokezot.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/57899735.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/roletowe.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/zalojofuwulugoxoba.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/31715013093.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/suwuw.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/67524670057.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/xikaropo.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210905210017.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/51761656554.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/0q6rkj23iek5uqaak695digfks/valasurekowunubam.pdfIn PDF document text
    • https://andana.us/files/files/vajoriwupo.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/jejiwubilumomo.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/91869660417.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/ravazibaraveropoxod.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/42446815306.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/fizitarapidedodilib.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/60894849964.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/xajoperodimutinigemavat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=cr%C3%A9er+application+android+gratuit+francaisPDF 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_off0000cb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE355 11080 bytes
SHA-256: 7cf5eba3bc966d9c41e2ea2ef25005d20467f7483965902ae147afe49129f0fb
font_02_sfnt_off0000fcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC6 18732 bytes
SHA-256: 7e05686f00c98f6b4844b0fdbee99d011d669fff49b8099056c6247d34615e35

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