Malicious PDF — malware analysis report

Static analysis result for SHA-256 30787d44a6114e60…

MALICIOUS

PDF

86.9 KB Created: 2021-07-19 08:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 11ed40dfd7139aa04cfafa7cd03c4e08 SHA-1: 4b3ea6586b29e9eb515828f94943c7b6ada5ab9f SHA-256: 30787d44a6114e60e8ffe4227ab5df5924b429df0d07e78e9510b59328b4c98d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to compromised WordPress upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6481aa430---12391532238.pdf In PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a275750a9d0---98560365462.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf22d803528---juribaku.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/girazofijetotuj.pdfIn PDF document text
    • https://menu2uplus.com/images/file/16995310134.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/57930242281.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/vonetamarulovimep.pdfIn PDF document text
    • http://tate79.com/clients/868750/File/65497947308.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/6pgo9mjitud6adnpvfl6nbsc64/36149011916.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b1057ac3bf9---58379744107.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607104f34f6a7---62156459335.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/5eb18b85888ecdf44cf4bb444189e03c/21519737425.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/midumomexav.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/25179421349.pdfIn PDF document text
    • http://hudsonohiohighschoolclassof1980.net/clients/7/7d/7d4b1ad73701457990394555a34ab01f/File/88898296169.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-9/20210509050043779664.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8504f57794---xadula.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/7998016d43bc7191cb2c517f704c5250/xomijaluvotugur.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/39537068598.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/22364801590.pdfIn PDF document text
    • http://foodchemsino.com/d/files/suramal.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa05501326---14520860098.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/bekazibejabaxuvonufijiv.pdfIn PDF document text
    • http://neenah1976.com/clients/17995/File/11768483572.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=lml+meaning+in+textPDF 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_off0000f249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF249 17536 bytes
SHA-256: 1f994c1dabe81f5b9db0fa1e9c93fd624bbc3acfabe6d634b4749f4ad02e68a5
font_01_sfnt_off00011ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFD 10124 bytes
SHA-256: 521e9c4ba546d0b06c9778e2fab00d37e21c63946c4f174c5ec6fb53305cbd3e
font_02_sfnt_off00013680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13680 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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