Malicious PDF — malware analysis report

Static analysis result for SHA-256 4473c24ecd6ea103…

MALICIOUS

PDF

94.5 KB Created: 2021-09-03 06:17:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 00e01daae802f27affcdc168b6c5bd50 SHA-1: 6bcd1659c2ea78b641f7fc89db7230d63a71ec26 SHA-256: 4473c24ecd6ea1030c1576b492d9cdefc4cc0e633a467a14ea809a19120cf5c0
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, despite some being marked benign, contribute to the overall pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://thegioituigiay.net/uploads/files/jimejeja.pdf In PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b744c602542---lupijajafimamutap.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/21256916284.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/2vum8ujcpgg0avtn5hfmpmsgkv/53394949663.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/s4ivplcb54gllgefssb2o79sk5/jeleliramugisotexisu.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/vuvedokadev.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160afcfd82ac26---71277870636.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/c363f79115b02f38abf41de57661940a/daretanobudizewudajemodi.pdfIn PDF document text
    • http://calliopegoodrich.com/clients/73417/File/dizogap.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/kamawuxaf.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/xupukapose.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/budonomuxezexesemen.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/bowojusikazekurafilaxuvaj.pdfIn PDF document text
    • http://plncse.hu/php_data/file/xefikuxoridojibuno.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be86c418b70---51494898279.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/noxabafovapopanilulowoxal.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c939e3b2d1---5793936706.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021073000433873499.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/v9249oviqta4s4rrmrm222cv19/fuzijepelepatezitotibiwa.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160764b768c279---kifiwa.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f3eacd05496---fitavasewavowirebusufenu.pdfIn PDF document text
    • http://varanini.pl/userfiles/file/guxatotetokugexija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=manual+tecnam+p2002+sierra+espa%C3%B1olPDF 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_off000101e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E0 11076 bytes
SHA-256: 2d9b2952461ff82e3bec24adfd590d10dfb5484a1b71e1039742c955d2cbfc7a
font_01_sfnt_off00011b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13389 21512 bytes
SHA-256: 9196e5cbce1a2a66e561c8bc4e079d690079372d71561c00c561790e548da39a

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