Malicious PDF — malware analysis report

Static analysis result for SHA-256 a78bf576d9150828…

MALICIOUS

PDF

87.6 KB Created: 2021-07-21 02:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 66f8f790129f79a75d430c6b4a4b72f6 SHA-1: 17e20e1944a0513ddf270ac1e1388729ed750d93 SHA-256: a78bf576d9150828df6e496bb69b9473e13c75b33ae25fcaba8311a2a1160d70
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The file also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting sites, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://iphonedown.com/ckfinder/userfiles/files/74974234689.pdf In PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070197a4c051---27493185723.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/84503855751.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b87988eaf---volitubewiwe.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092ff7f492bc---rogifetalonuworazomisito.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/44934527314.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/43217834887.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/nerogupujevo.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087162fd0aaa---45712462262.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/73815236348.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/pibumebanibom.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c23b918288f---kojigeboxotojolifus.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/afvnn5c7flsvjocj97o0hnpk82/xawevasunakeko.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/jewomobubufutuwovusijirip.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/96756338687.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/l934ard6kalager0a7e8kvrquu/52788009082.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/33771681950.pdfIn PDF document text
    • http://dmscsmartlifeblog.com/userfiles/files/zugujewofabedajo.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/qut56bva969b18pvt8lb6ihk3d/ginodufe.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/vajumenenagamenud.pdfIn PDF document text
    • http://ttc-investco.com/img/files/liwepikegepunisagofu.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/9ef84d90493ecbade81c3b224fd029c6/rifajiretapiwaz.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/misibaxip.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/56692739568.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9978d4e30---wogugitagurifepinozobaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+long+should+i+wait+for+him+to+text+mePDF 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_off0000f25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25E 11080 bytes
SHA-256: 668d0977e26fa4bdf0909763b3a21c84579f7fdc9176fad70048a9b5f45e4213
font_01_sfnt_off00010bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EA 17196 bytes
SHA-256: 3a1cbd6a82bcf7142028f4f9fb9cef2867c1c64d60f1446edbbb3bd28ebfd7b2

Open this report in the interactive analyzer, or submit your own file for analysis.