Malicious PDF — malware analysis report

Static analysis result for SHA-256 77df1844320db63c…

MALICIOUS

PDF

91.2 KB Created: 2021-09-10 09:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eb27c9cc98dc50e925f075182feafeaf SHA-1: 16c22a79817a474335405d5d9c08aa772d2de3fd SHA-256: 77df1844320db63c0119e55ff6e657c55b77979af562632c38f785c8c0ba9daf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs are consistent with a phishing lure, likely intended to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cmuniontravel.com/userfiles/file/kemin.pdf In PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/govulixukomodulubago.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613284f773acf---runimexasexer.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/1976148585.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aced8950be---19295634300.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/wizidet.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/8e4cvumh72fsupnsif20to2osm/sogijivo.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/50697963842.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19814999267.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210910081410.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/nuxifobodokajoguwojivi.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/jupisusukomonigob.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161368779c285b---25325011189.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/fapijopowefifad.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135b2383aba7---96410159422.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/87894665467.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/runusofuvubisoju.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/pifufig.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/fopojanabetewamipa.pdfIn PDF document text
    • http://sabaparsian.com/ckeditor/files/files/69116797626.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/dopofifulojub.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/muwejonivagutol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=saw+3+movie+onlinePDF 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_off000103b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC8 10300 bytes
SHA-256: 62e4a49fee0d6246af575ee4168a19903ec3c34b4b69835aa32e556b3b3f3adb
font_02_sfnt_off00013303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13303 17228 bytes
SHA-256: 5fe9492716af1f47148fbff4d52e54e9c24a8730f33a3cff1d0458394fef78dc