Malicious PDF — malware analysis report

Static analysis result for SHA-256 05354a51ca56da5b…

MALICIOUS

PDF

202.5 KB Created: 2021-06-27 15:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0d2a0b012531e55e4a55d2ca5d0cf4db SHA-1: 21c3dcc78b395fbc407b80128e640f5f4677b18d SHA-256: 05354a51ca56da5bf38fc709a79f5c48d2706e2eb2cf8bbc13939ed6d4d37ec5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage, suggesting it's part of a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate an attempt to redirect users to malicious content, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9899

Heuristics 5

  • 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.
  • 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 https://watertorens.nluserfiles/file/telupida.pdf In PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/fowozoginewuzoruzarotapug.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/dutagumejixosefemivozi.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/8369293154.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae1c2b1589---muxomofuvokaz.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/75157491922.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/s6actr9mq3aipu34p2kf6vs6e6/54720156936.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/morowanetu.pdfIn PDF document text
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/rifegilewepuleliwosuviwag.pdfIn PDF document text
    • http://cmtsport.com/pliki/2741189915.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/5airtbmbk3mnv9cljrrvkiglm5/68217915434.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/9084bd75de6b56305ec577fd27b3baf7/13724070739.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/xagaletudowi.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/91746853233b9a9f9e1363279a27753a/pogede.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080f301430f7---13862638640.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/fnq5q4b3vnbqe9me0cl0ltqnst/67224514862.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f69454f9d5---ruburizebowokajibazugeto.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724aa137ad6---jafipejexenexoruga.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/xivekemeputafusetepowepoj.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/38052848817.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/c22917610aed52e6da359bd485bdfb94/14866937643.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7d40808568---56161136291.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=guillotine+above+knee+amputationPDF 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_off0002bce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BCE5 10584 bytes
SHA-256: 4e20d12756ad4729b021ef56a47e0bff73b6bc9e6ee8d2ca77359a093b1050ab
font_01_sfnt_off0002d4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D4DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002eced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2ECED 18072 bytes
SHA-256: 83484589b0cd589466452c5f432d355017faac7328cc8e9c908583b18dd3cbe7