Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3070d80eecf6a55…

MALICIOUS

PDF

81.6 KB Created: 2021-09-09 11:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 652464da709e7751062ba681b2c52286 SHA-1: e8e3a8fad92f978d5681cb1f5f98414f0f66d109 SHA-256: f3070d80eecf6a55fc22f6f9f0c34b0629ab0ea77c604b37515f68a5f05928d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms points towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://crewmak.ru/uplcv?utm_term=how+to+turn+off+a+phone+without+power+button PDF link annotation
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/weperejuripumogikitu.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135b6b46db96---wizisatixiboz.pdfIn PDF document text
    • http://shriramashramps.org/userfiles/file/felokate.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/mazepita.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fc8fe2f12---47571892646.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/10273267906.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/munusaronusonofifas.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/68153473679.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/rufajanilomomipe.pdfIn PDF document text
    • https://phuquiland.com/upload/files/tekalakinefizulefubivul.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/jowajidawuz.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/86203572165.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/98826664782.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/nasuwikozopejedabosene.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/birujibunun.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/tcp1mpvdo9hm1o9hhmjas31jan/14230431791.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/xipudib.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/87714109864.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/zusomapuwas.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/424786675.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/2378347597.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f5e46701f---29196225870.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/98744710019.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/040953128113.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/tulivudovatoxu.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_off0000db76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB76 17696 bytes
SHA-256: 1076b6e902fe742506ad02469b24eb84daf0c02365d58bbeb5a586bd3e57cb6e
font_01_sfnt_off000108f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F2 10560 bytes
SHA-256: 8b087c1dfc03b99f15014a3b9609c940e24bf12391bfb29da0eed1648614c635
font_02_sfnt_off000120ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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