Malicious PDF — malware analysis report

Static analysis result for SHA-256 b569a0920390aaf7…

MALICIOUS

PDF

82.8 KB Created: 2021-09-16 02:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 016413ad56c38d519c03351d62e81737 SHA-1: ddb51df9a0c663fb4508db399860aa6bd9259160 SHA-256: b569a0920390aaf73f1f5bda6caa3ad525763a20168c448e085bfc0c70270e54
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://gullyracing.it/admin/ckfinder/userfiles/files/96872171280.pdf In PDF document text
    • http://xn--e42bt3l.net/upfile/files/sedepewawosaguzevewuk.pdfIn PDF document text
    • http://01host.ru/userfiles/files/76877855450.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbce54b2f5---wegepajizarisak.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/vimawagarajitikuguxewam.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161310714d0b6b---zelekulunopobitixovopun.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210913051738091720mle9g.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/4b06d81dca7e7b5ac9df9766609e4425/27535963738.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/20336785112.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/diduvawowemosotisovesesi.pdfIn PDF document text
    • http://skncn.com/u/files/dotaxariso.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/rafemalisakutesadurun.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/20373701702.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/62726518364.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/gupepodagibewibaket.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/72081598292.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/zobusazupezikutosokomegu.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fe5a6c17a---budukipupejiwulexigazakeg.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/mafidilubivebutolozebar.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/rilisep.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/sijotometaxivolibasabag.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/maginoborogaxiwixerobajap.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/55059538426.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/54382210339.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=attack+on+titan+battlefield+apk+obbPDF 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_off0000df2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2E 10560 bytes
SHA-256: a49764209ed11401d7929d7b8e82bc7495253bf006b78955e43d9ca66f50f484
font_01_sfnt_off0000f739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF739 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4B 17540 bytes
SHA-256: 0b675a8d7083d481a0046dba931ca53a990ee0e62867e6d0f9f1286871ca84ac

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