Malicious PDF — malware analysis report

Static analysis result for SHA-256 307bb5ef45342c42…

MALICIOUS

PDF

79.6 KB Created: 2021-07-30 01:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eb6a3a7dd2512b558d9ef3c5089381a9 SHA-1: 235c773d0dae79582726e92c328f5ae2033103a6 SHA-256: 307bb5ef45342c42c19a8b22fb6faab53d8a6922ce03c060c2961deb7953acd0
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous embedded URLs that point to compromised websites and potentially malicious PDF files. The presence of these links suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b83977f46---tagoriku.pdf In PDF document text
    • https://ajur.rest/uploads/userfiles/file/kufewiniligozes.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d3b560df5---45239370930.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/nuvuvav.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/91263563415.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/2r27i094tn8qf6sv8395r0i000/66408252341.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/65f3194c566e9d1ec653962529b1a7d5/wukawatubejexowuwukofa.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/guwozizogitib.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/ncs3hafsp0hhs8su0vj34qv7s7/35922436491.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/65206646505.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/glo5hlu3k0ljequ1t1gktcm366/texuvo.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ok9evtpnp4a9ru257rps09bq31/tajafomivironoseneragigin.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d8d47d40---88194831469.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/61091414620.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/4faj16cqg8884fh41p2p9svflc/76934252126.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/dd47d8904091c37acf4c6e0944d51844/1049604627.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f179c65253f---zedurinugo.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/wepawowotajovofosafugeniz.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/fixijomewirixuxorumit.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/dirafaxisoginirije.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a60546cf3---bogukomaku.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bccba8adbd8---65303416328.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=grammaire+progressive+du+fran%C3%A7ais+niveau+interm%C3%A9diaire+corrig%C3%A9s+3e+edition+pdfPDF 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_off0000cbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD3 11648 bytes
SHA-256: 545537a2716966414d4f57edf4970b300ef6a77efcfc2d4ae2a33bcdd54e3f27
font_01_sfnt_off0000e6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CD 18328 bytes
SHA-256: 782d7aafb2a357ecef0af1a9758928d31933698579360132998b9173cde61b0a
font_02_sfnt_off0001146b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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