Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4b93dcdde80d8c…

MALICIOUS

PDF

84.1 KB Created: 2021-09-07 23:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eb111606f94cb58a5b2025deba3c7514 SHA-1: 66c99a892b934e9af7d32bb43f0837b25e1de35c SHA-256: ac4b93dcdde80d8c9a580ccbdc3e548b744de8d518a2e8a1ab2c22744be5ea1e
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The PDF structure and link farm heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://ducthoaudio.com/upload/files/diwejitizaboginokapuzogu.pdf In PDF document text
    • http://myafmc.com/clients/a/a5/a51d49d85de18111a3d718c63a5e5081/File/vevilomo.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/17441891190.pdfIn PDF document text
    • https://ivantomanov.com/userfiles/file/26648934170.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/fbc85801adcab66de5a796cd414188bb/giduseraxezu.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/zugumakomulo.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/1113186368.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/87348889945.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16077d854cf7fb---20379756526.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161073fdd8c660---wazizolifebofopiz.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/d2dvbt0dvbujfcq7u1meha848e/39878575648.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/rbs14c20qtn56folncge3e22ac/8647242775.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607718dc1fc7b---wasidutapewimiwuwujo.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/upj1cb6mqar7a1lvbh56p5uvkl/11667474133.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f13ed705392---53731408269.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/98501740977.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/wosisigitupitunuguwelud.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e7e612452c---jogija.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/55c2bb20cb905b2c8df84b1563d6c547/23044304206.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/94764434390.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d2b6286a1---simawituja.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/pdr9sg8199tcvd5qjmsnqlu22b/dolofimevodad.pdfIn PDF document text
    • http://colescastle.com/clients/875019/File/48325866245.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/6c9a8f909bfd370da4eaf2bc79d9f6b0/baxuzelifiwopumosola.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/60279592102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=tangent+word+problems+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/ad62d1f9a870017c372a5bf187c54b66/83612015957.pdfIn PDF document text
    • 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_off0000e2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DC 10940 bytes
SHA-256: d12c6d439d72a1af35e672363734a20f7df4ca5bab9ab44c206943b30bb817bc
font_01_sfnt_off0000fbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDB 18168 bytes
SHA-256: 370f82291d1556a9aecf0b76db201db70c2c88a378e0be0cb9d7df80499e3486
font_02_sfnt_off00012a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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