Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6dfe5327ad9e540…

MALICIOUS

PDF

81.4 KB Created: 2021-09-18 09:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3533cad4623be6db68b3fb0c5b8f0079 SHA-1: 1688aaf198145db7c53d1398fde8b47b6bb12f3d SHA-256: b6dfe5327ad9e540e06eb6565fa732c80ed2aa3c6881ac46ce4bc7ebd3f842ad
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable domains, indicating a link farm designed to lead users to malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. ClamAV also detected it as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://sofupingame.net/calisma2/files/uploads/dusibazigakuwukijozakoj.pdf In PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/ziketatori.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/35562597015.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161369196c22e3---kamesekuja.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/87747761573.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210903153516.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/zulom.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/cd40d1f02973324899c4d16640e1b8a5/85425353339.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/livlcukpph6k8pgsn4gvhu9gig/19780972010.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/rajomosuriwa.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/67027903882.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/sifovajaba.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/7p6c581d86cd77n45uf32voo9p/45949739550.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/fimun.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/70528194361.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139fad15c5ca---64879989431.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/vofefesuxujarelazek.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/28915424838.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/ridikulirokexaxorimobor.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/kozapixikefus.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/85157059934.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+watch+minari+freePDF 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_off0000d8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AB 18572 bytes
SHA-256: 89fa0c5c56f42ca393174d1bfb373564cc62e47d130441e46e1ffba4d69faad7
font_01_sfnt_off000108e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FF 10464 bytes
SHA-256: c4b148217d8f1b5fbd0c1258ddf1b30e1bc832363fbb16ee8acaf9b92a3e9499