Malicious PDF — malware analysis report

Static analysis result for SHA-256 765ed0fc46361d83…

MALICIOUS

PDF

83.6 KB Created: 2021-09-18 00:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: f76a8be931003b4bf200aa036f3fef04 SHA-1: 426839b9947448c233d33bfab6ce9ac98b762860 SHA-256: 765ed0fc46361d83458b032cf4291c3d84eb0276c825cffc44e283e16e5eff85
196 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple disposable hosting domains, a common tactic for distributing malware. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download an archive, which is then password-protected to evade gateway scanning. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ufnk.fr/app/webroot/files/file/47660284496.pdf In PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/riforipudoxupujo.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210901181829.pdfIn PDF document text
    • https://songiadahoaian.com/upload/ck/files/kubekijodijawowazuveje.pdfIn PDF document text
    • http://berbun.com/user_img/file/dunaredufaxisizisojofof.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-17/20210917195711868175.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/puvozegafixerizunizo.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/nirunawimi.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/61025183646.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/be982c33e0517dfa6ae58df9d24b7e48/55775786796.pdfIn PDF document text
    • http://donghotam.com/luutru/files/49643838274.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b517d34aa---66392064288.pdfIn PDF document text
    • https://onlinendttraining.com/files/vegalesipibazewara.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/38673191225.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/75159337678.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/78198403590.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/mizerut.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/3b590de2da81e9924f885e8bb8cd4228/vazako.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/gumapufuluxabiped.pdfIn PDF document text
    • http://minipit.com/data/files/66190557676.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2150cbbed---97881274091.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/xenolu.pdfIn PDF document text
    • https://toocapen.com/files/22475464396.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+bypass+phone+screen+lockPDF 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_off0000e2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EC 10804 bytes
SHA-256: c2561474e7e532a82944ff9dc1bd90266c51b225c21c5f4795eed41d14c2840c
font_01_sfnt_off0000fba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B5 17392 bytes
SHA-256: ec012ece6df1e1ae94db9e9fbb130cc54a971b15edcdba41aac8b25aeb8af17e

Open this report in the interactive analyzer, or submit your own file for analysis.