Malicious PDF — malware analysis report

Static analysis result for SHA-256 bab0ef7673646b59…

MALICIOUS

PDF

81.4 KB Created: 2021-09-05 09:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b6f76425b02f8090f41d42422c496e57 SHA-1: afc990d7e4e8f2a41cb60befd2a32ed13e8a9d43 SHA-256: bab0ef7673646b59ee21c986dd75946c0012a883b0609c077ef44e8120c902b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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.cbs-emballages.com/upload/file/jelujoperufenumira.pdf In PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/f71196628556f08fcc3d3eb8af23c752/76300645921.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160761f3b091be---5329720339.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/walirimigosaxuri.pdfIn PDF document text
    • https://amblamy.ee/upload/file/38249818444.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/negisarusifoxasun.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce6c3239f1---vekudixep.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/wuletugovupujilofi.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/zalavewef.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/bn7hrd6lfi1ebdou9vko64u258/64414681307.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210516020149.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b14ee2e7b6---63154281853.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/2961778794ad60a9434c9cf58bd2d442/60900719570.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/6ul8en587c200rn3ula95sqvk1/36679520892.pdfIn PDF document text
    • http://gibisch.com/files/files/76397464242.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/87325243247.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/4908810163.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9970a0c2b---sitadowef.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/f3c86bfe188a57761282309f99055f20/nowawoxepabikefadufozot.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160839d3ce793d---gekonemotupuk.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/lutaxusomejokosu.pdfIn PDF document text
    • https://subarini.ro/mm/file/42333103646.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/16656616255.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/21166741052.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=information+technology+books+pdf+downloadPDF 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_off0000d89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B6 11448 bytes
SHA-256: 635c242a495ffa2303585be3dc890c4ed55f648d55dbe973bfb97cd160d22070
font_02_sfnt_off00010b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B33 17036 bytes
SHA-256: 6a96427cbdbcec353f3b3cdb851d7aabf11c62be0509472ebf665ae689ed5e34