Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf087fe493cd0251…

MALICIOUS

PDF

107.8 KB Created: 2021-07-05 17:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6826c106193c2383b0eb704f2cf14727 SHA-1: e09b863dca10fd4ed27240742c64e99599b2ae3e SHA-256: cf087fe493cd0251ea9f50a069a0138f8756ffcc33bab2eefbbefb3a7ea02930
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URI heuristics point towards an attack pattern involving redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://aksaaydinlatma.com/img/editor/image/file/purevanegi.pdf In PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076a7ba2f3be---3307067184.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609114ce6da2c---zerabonekalejijafip.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/3d4897ead62e345a8010abb98505aa27/16843015861.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070e2fac399f---46705089011.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e21e19ec4---31609007063.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/5g3pvhq9vi86bvlr632jf75re5/tejaboworajikanalakamer.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609045aa9c631---gadojamekosinivebogij.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/govisepotepogogakaseke.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/92d71d85f2aa7180ece1525adce19b1f/dadisamuro.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727f598b800---nevunuzoguwu.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/37857727039.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/5873828693.pdfPDF link annotation
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/tfdguu9klk42vgovqaj798jfk5/nusapobirijenefi.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/jeganuresozenagebevupupet.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/bikidagegaf.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca31e9c1dc---vubina.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/7d68bd6eece53869902f53354d0520c6/32106578059.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/mr9b5gu53t6okrh65mj2o21vku/numatadarizan.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/boninosevaka.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/81979833244.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb0b70f0ab---koguzarovak.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/naradagunid.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f734598b8---nufozekupanapebodesezib.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24680f076d---92850780729.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=margaret+thatcher+and+the+euPDF 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_off000143a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BB8 17576 bytes
SHA-256: 56341ce72d2315b5d96262a0ab9e15db9eabb9178369cd8fb5646a75de1a820a
font_02_sfnt_off00018972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18972 10316 bytes
SHA-256: 990c76757063fccfb97a42fc5eee27eab2c15f1dfcb717fac7177fabf4d5f435

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