Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c9c4d3bf129eeee…

MALICIOUS

PDF

90.4 KB Created: 2021-08-12 14:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e5c41bde91f92f38574fe33419aaf7c1 SHA-1: 72c9eba946c698ff5aa4f5a4f44592bd9f28c681 SHA-256: 6c9c4d3bf129eeee76cedf1bbd058d55da0cd29b871af8fce5ac372e78033c46
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to potentially malicious PDF files. Several heuristics indicate that these links are hosted on compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/cf1b3f0852865415f63262e904b818ec/10766176280.pdf In PDF document text
    • http://157.230.241.115/image/upload/File/51115797145.pdfPDF link annotation
    • http://www.abcklima.hu//data/editorfile/58053625363.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/zovipubum.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/60979612986.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/82729434992.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/33f9fee0ed7fd52f2da5cf37fff51142/sesafujo.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd89201b4c2---36935130657.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/83060858674.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/dojupifofazenuvopajobo.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/08f6e85c8db919c3049b8bbec0dde98a/nesenanigemaxoro.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/votibotulilo.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/vugowukaxubinapij.pdfIn PDF document text
    • http://parentini.it/userfiles/files/66073130506.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4df62e9e1b---vegirisexakevusevekexor.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/putibejixiwofet.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e121c2ce9e3---88452915105.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/a5bfbf8a6d55e24af71d14f22454e620/3948033065.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/92228303586.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/44531794834.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/467f9fcffec43b88938e253e9537e3ca/bupisofisunez.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/77953142804.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/fuzadabotegurugusajojakep.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/47845030309.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=dreamland+burning+full+book+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD91 18336 bytes
SHA-256: 30ccdd8e5d2265258c5289e59e8b585b8fe05da901ec5c9807e34f6c4f89f823
font_02_sfnt_off00012e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E21 10908 bytes
SHA-256: 8a6d39ee29135df450ca1ce19a6ae30c37ffa2626008ae5e1d8ea434f6f69a2d
font_03_sfnt_off000146ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146CE 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd

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