Malicious PDF — malware analysis report

Static analysis result for SHA-256 94a43bcb346d51ce…

MALICIOUS

PDF

768.3 KB Created: 2021-06-28 13:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e2239c7ece3a3e707627c5785ecdc9dc SHA-1: 38963533a9cba88f8cc7401ee005425db9243d48 SHA-256: 94a43bcb346d51ce6701f172bebfc093edf40e5837dcb4e28d6967d8f7046b62
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of multiple external URIs and the detection results strongly indicate a malicious intent to compromise users through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5128

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nomylo.ru/uplcv?utm_term=things+helen+keller+accomplished PDF link annotation
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/b55b5a6f772f3babb6e0efb4a35c9091/52997117542.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/64b888d26c4710363246ba5b2701bcc2/jigugebo.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce9452690a---kozepufoxuvojapatejofe.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/zuzepivotumoval.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/83655819859.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/9347384bae1a934d243b5afb229d70f3/62535527700.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5633be0311---kobudapikogazukexosis.pdfIn PDF document text
    • https://tmtteks.com/files/mojibupado.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/b231c4c6005c29ad3ed7c0732e2b1f69/78488466802.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/suwoxonamedulezulatilu.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606edf60163f2---85987340073.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085f24dbbd67---gexazavafiwidatewoku.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/6q6okii6r1pse67b0b9l971p6d/refonivixisamokesuj.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608014860d768---32066296415.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/rujajetakufejirurifomom.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079396235d25---51962605835.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/94966975981.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/tugozoburog.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/wirugawupezop.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b22c8a584---rijoronuwi.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/s8mvv54nmmsjrul676go2tutb3/vasitu.pdfIn PDF document text
    • http://esejsc.com/upload/files/9341261262.pdfIn PDF document text
    • http://short-story.ru/upload/file/wexag.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe1233428---naxifavuxokujadab.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/9671bfb6b23e24b3ff2a1a9e5b71c832/dosajediguwogazatenog.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b53795c84a8---lamaxevaxululo.pdfIn PDF document text
    • 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_off000b8e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E86 10920 bytes
SHA-256: 6ddb5bf49e6d7b180a20aeb46a674bbb35a5a0ba771befc634a90bfba989ba25
font_01_sfnt_off000ba76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA76A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000bbf88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF88 19568 bytes
SHA-256: d54e5ee5ca881392b07b6b5091cb8419883595cd56cdefe8cc192f6e9429501f

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