Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cdf00aaa1704f00…

MALICIOUS

PDF

84.7 KB Created: 2021-06-26 01:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: c0c3a834a0cc9b8d898a655212e33c6e SHA-1: 2d90a47440a44a7f74d2ddbdf6a0f8a00f9f5449 SHA-256: 1cdf00aaa1704f00a20d16ccc98627045c5cdae0dc7d32129c6925b1d189b1a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a pattern of hosting malicious content on potentially compromised or low-reputation domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://france-ex.com/images/blog//file/gufezoxotiwagegozotex.pdf In PDF document text
    • http://wecans.net/_UploadFile/Images/file/19893988886.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/29874681919.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c400e088d5e---sujidowexobo.pdfIn PDF document text
    • http://restorationteleconference.com/clients/73716/File/setez.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/dufotu.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609c78d6a1747---9918355375.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99ce7d0398---69142466952.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766b2eaf3d5---doriditazalixaw.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714079f2d30---95612409707.pdfIn PDF document text
    • https://andrejc.si/files/file/80328799565.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/e67fdb074dcf9c503c515d28e7a2292e/24367191951.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840a5f9ff3e---54582520747.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/17685525715.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/27652584014.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607771064d95c---mugeliza.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f049ac5aa---15421193477.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/7030409081.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160861b1610821---15740695581.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e67227b5e3---veroboj.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a3458b9340a---xekinotexax.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083ae300aa32---xibakuwabef.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/fonowadabodi.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/ea4849315762cb7aaf01c3a4329543da/poditokizamenibaluvurifum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=acceptable+dissolved+oxygen+levels+in+waterPDF 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_off0000e8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DD 16264 bytes
SHA-256: 340289ede818aa7ad35c75e54614920504b7241118e788e357bf00611c1a6549
font_01_sfnt_off000112fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FA 11176 bytes
SHA-256: 2ce8630bb06b32c4255c1f0a6fb496bcaadd57aa5f4f172cc36ed0949439b2be
font_02_sfnt_off00012cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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