Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a2ce48a52e51b55…

MALICIOUS

PDF

157.7 KB Created: 2021-07-02 06:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 39a51d7d521b4774ded2c346b81875dc SHA-1: 278100a2e3b6d72c1f0bdbfdf5e2586a0d5acee0 SHA-256: 9a2ce48a52e51b557cf36636f1590bb7a5c8addf901c96d6d007747dfd0f2407
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to compromised CMS upload storage, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607de381100b8---mevazasexi.pdf In PDF document text
    • http://www.look4job.gr/images/_user_na/file/68328100839.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/nmf1hr0fe9kb8ff18em98pdjg9/demotipe.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/nvagtikmvhvvs9mc5sidjimsbd/maxamuja.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/zubode.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd408dd2a7---34677252715.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/84594961123.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/75159252838.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf158cdee13---40994531352.pdfIn PDF document text
    • http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/58008725283.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/60328813859.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06bb796306---75910687216.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/rllhkllh4g2l2gl3urmgimcniu/68846130529.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/80936866009.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/65998630266.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/raguzezukuzajukilazamike.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/84584e483a3501de84e64501a8195d0d/berekuvavogu.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/n1vqt0a693vb2b92170s0876q0/nazezoxamoxotopaxep.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d99c0e8708---muwinexediv.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/4e63d996ee7a6788945c2dcb09d01adf/91823709435.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021052206481573499.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c756d071ec7---latasurep.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/kazebub.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/23618081517.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/kojegigejotevej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=bob+seger+and+pete+seegerPDF 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_off000209cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x209CF 10624 bytes
SHA-256: b5f29f638cd6787be534df6d90d73899d0040a120c226bfc06b115bf166a6f89
font_01_sfnt_off000221db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x221DB 18344 bytes
SHA-256: 3718e8af7445e440fb8f3c9ad84ca030907d2a17a11fd6ad91c47dc6ca4980d3
font_02_sfnt_off000250e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x250E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1