Malicious PDF — malware analysis report

Static analysis result for SHA-256 979d7591cac69a44…

MALICIOUS

PDF

87.0 KB Created: 2021-09-22 12:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0c0509f3b43c0bc04710603b8b8befe0 SHA-1: 133bf480e8c0cfe4c71845a136b80f579e2df785 SHA-256: 979d7591cac69a44d3e91bfdfb65647a3ce1aee066ae5c6a20a67e5e7739ace5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious PDF 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 https://chcial.ru/uplcv?utm_term=5+games+like+gta+5+for+android PDF link annotation
    • http://snp-ent.com/files/fckeditor/file/63579196461485445529af.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/40628594845.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/84938991240.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/76202255812.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-2/20210902022716492031.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/kivakuwo.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/29442651407.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16139de95a713e---91875182599.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/51333166959.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/84366105735.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b03bd33c69---depogexezew.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109140047058922.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/78620780926.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/pegemiriterirelajubek.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/zonelopafamiw.pdfIn PDF document text
    • http://roosprommenschenckelfoundation.nl/userfiles/file/lorotopukalifedefo.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/66f816f7f238cab3ec477e940bf1c182/36377965368.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/59264051975.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/92551403807.pdfIn PDF document text
    • http://szwygs.com/upload/4023296860.pdfIn PDF document text
    • https://szpital-sulecin.pl/images/fckfiles/file/89913277370.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/gisamijufajoxado.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/zaxebiduzekek.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/firuxixevepugonij.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/161368fa96078f---bovuvetatanisimuroket.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_off0000f1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E6 10824 bytes
SHA-256: 76b500fbd41fcc9c5fb995e7fb078c097273688e0e3a30dd2c9c758a0ce2707c
font_02_sfnt_off0001229e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229E 16752 bytes
SHA-256: b79552269f60e8e1a1d5f4d4c0acacf79df77f2bc686d95ed20608fa818627e8