Malicious PDF — malware analysis report

Static analysis result for SHA-256 f20794e319867ba3…

MALICIOUS

PDF

85.1 KB Created: 2021-09-08 20:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 20f8a78792c0d2c7a59b85c77dd597c5 SHA-1: f34e87ed3fca6e56dfb1ace27b5faf5c8a22b2f2 SHA-256: f20794e319867ba3146110881e0ce8d7a6d0d587e5e08b7055a4e1a21aa4c8d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious or untrustworthy sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://fnathservices.com/upload/file/rizugodowo.pdf In PDF document text
    • http://veterinariomauracotti.it/userfiles/files/99595396889.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/67b29ad4777d04ff76d20d033e8db0dd/kokazutelur.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/98825868914.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/31081559077.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/il0b756pvisrqoflmln0d7v297/86686318778.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/7593560829.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/45381334832.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/4q89kdfkasti0g880g3kovj3pa/48498447343.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/37566895316.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109010613584999.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/fusovabetibe.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/kafaw.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/34475778648.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/jewamopunezibuxijatifonip.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/tenaduba.pdfIn PDF document text
    • http://upakuika.com/img/file/6281393280.pdfIn PDF document text
    • http://gibisch.com/files/files/18488009339.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/liwoniredavixokewe.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/11082860221.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/63890453110.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/mizovezisejufigisud.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210908_54806946BA40E3D3.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136cce6bb663---94530873021.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/zumabuwaboki.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1630546650.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=adenoma+hipofisario+en+ni%C3%B1os+pdfPDF 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_off0000e3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FA 18812 bytes
SHA-256: 80835040dd4d84bfc2cce0a1050ad8a21bdd5ba6bd5ebcb96fb2fc6ad84009f8
font_01_sfnt_off0001136f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136F 10808 bytes
SHA-256: 5254a300327c8cb3be7e106ff5fc3fef6e6520f77e1fc9a0a08b2e4194a33680
font_02_sfnt_off00012be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1