Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2e6f07259cb3ec8…

MALICIOUS

PDF

80.8 KB Created: 2021-09-07 19:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3d9414d536f44e71ed80224d2d636470 SHA-1: 68d355e1661c9bc095727217c78489866fcf2a58 SHA-256: b2e6f07259cb3ec8021ac2ec93a0ecff8a78f1712e40f323aef1251fd26319ea
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. The document also features a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute further malicious content or redirect users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.knickmeier.net/images/pageimg/file/vujukeson.pdf In PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/63421976257.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/viwexidujuj.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/ce433fb9b541e27478e7d79ab24e6e77/77890908894.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210601155105116.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/vafufepomilakabe.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/arogkk2i1esrrfv1an226du2j9/77944584458.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/fonomiwamepisegojiriwifo.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/kenufapabigosisisijobegi.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/43541805007.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/ea473d28127ac3cf39b6087d3e3a05c1/64135940812.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608321f62f257---21689404206.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/5kk4nh99gmldvijghahqn0ebvr/kixazitos.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/rugaxugujirizi.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/jegusejegele.pdfIn PDF document text
    • http://www.sealjet.mn/pictures/files/6434880867.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/35674687998.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/savumubiviximegaxe.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/j7evlo68j9sermr36nr6svcd4g/39891341258.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4fad75db2d---fonozuminizivuwidene.pdfIn PDF document text
    • http://poiskvod.ru/images/file/zetil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=claim+evidence+reasoning+in+language+arts+worksheetsPDF 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_off0000d677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD677 11192 bytes
SHA-256: 89e3274ff21d96548e473d103706a63392aa6c1f8137ed0b62682b24f4eda146
font_01_sfnt_off0000f050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF050 17924 bytes
SHA-256: e969c37c9fd5bdb7dc3f6e83c29e199e6de54a34e269898240b8bfee4ed9bdbf
font_02_sfnt_off00011dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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