Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c29c116aad595bc…

MALICIOUS

PDF

86.2 KB Created: 2021-09-18 05:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 32574bd62cc4e2f0e1c74dd7bb34d5e7 SHA-1: aa81f19c45349de5f3f601f8f7f1d93c335273b0 SHA-256: 7c29c116aad595bc255a93d9cddfcbc8d2b287cdcd6017c574b56ae4b97718be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and URL analysis point towards a phishing or malicious redirection attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://buyyoutubecomments.com/ci/userfiles/files/14015292376.pdf In PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/nupalunojuwagogeb.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/rejogod.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/kogovibobuvenosu.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/89525164912.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/08c773ad43006a992cb1ffd947ec913f/buvegevafosividomikilopo.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae393afb35---86112537699.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/hvd9r4p4rhhs7km3lsg0mc1cp0/31983662632.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/16126549595.pdfIn PDF document text
    • https://la-klamm.org/Files/files/dutoratazimodijaguwod.pdfIn PDF document text
    • http://beiks.info/public/file/62155917289.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/pudilulitogowusekojukojez.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/vufetofexebutedawoweva.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/97961433388.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210918_DBE23BBD78324DD0.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161433639746ee---numuloxukugazoxeneluruwa.pdfIn PDF document text
    • http://benetalent.com/upload/files/kikegatoxajanulutit.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/zafezeredaxuji.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/lvso688q4cfcl6rnf5of5000m1/kupel.pdfIn PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/33917252904.pdfIn PDF document text
    • https://mytopics.it/uploads/file/jogelabonigazanegopa.pdfIn PDF document text
    • https://ptogel2.com/contents/files/jipobaxemewadiledise.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/69813820858.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614224877957c---boninifakirux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=symphony+android+phone+price+list+in+bangladeshPDF 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_off0000ea97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AE 11292 bytes
SHA-256: 377f262b5043ec1dc38174d2c0c1f2cc363333f8c1f77ddf3b8a1aa2e673f0f4
font_02_sfnt_off00011c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8D 17656 bytes
SHA-256: 27add4c6e1d146fabf43967eca10f913a5adbf454071b36feb120c8a5e0ad8f7

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