Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c35ea8bfe744bcf…

MALICIOUS

PDF

69.6 KB Created: 2021-09-26 18:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b0b482fbf8d99622c834be4a3a908d6 SHA-1: c9ece34e9ce769d47d19c8059539792c4241a041 SHA-256: 5c35ea8bfe744bcf56f9b6265faf98bebe63aae02a27e48d55c5795ed31530be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms hosted on compromised or disposable domains, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://oniceh.ru/uplcv?utm_term=fantastic+beasts+original+screenplay+pdf
    • http://esteticka-stomatologie.cz/files/content/file/xebeva.pdf
    • http://kavernoklub.com/campannas/file/vabelukudixi.pdf
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/wegakadekasajij.pdf
    • http://zopos.zohukum.com/ckfinder/userfiles/files/telafatisefapuxivifofurog.pdf
    • https://tarzminder.com/resimler/files/80540183295.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/k7akpetm09l9uthcsl5vkof8i1/64268151233.pdf
    • https://rugsdirect4u.com/uploadedfiles/file/pojotevojadoluboluxovis.pdf
    • https://jagamimpi.com/contents/files/37687181017.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613534ec3b5cb---vofimeriwuvo.pdf
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/50688370926.pdf
    • https://machnhaduong.com/images/uploads/files/38851570515.pdf
    • http://antichigelsi.it/userfiles/files/posupesokiwifikikopin.pdf
    • https://expobar.vn/app/webroot/files/images/pages/files/87601146452.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/40c7f35dea78a6451e602290fa55824a/tanevixujijet.pdf
    • http://www.clc-engineering.com/siteuploads/editorimg/file/58084815036.pdf
    • https://atvatextile.com/upload/ckfinder/files/bopasuwidebuxazik.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db39b1eecf---gujuwajolo.pdf
    • http://marleenjansen.nl/images/uploadfiles/29335468788.pdf
    • https://awinresource.com/uploadfile/file/dimogobot.pdf
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/liwigotagogilobegogikij.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/a34ec499dc96e358f4e2c6eb78bcdd9e/mupixexavifenalivukoneve.pdf
    • http://amoy-art.com/Upload/file/13304851101.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afe6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE6 16792 bytes
font_01_sfnt_off0000c7fd.bin
70169563bfd2a105f1b22f9639dff9786c26856dc27af5232e5bd63bcef6e025
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FD 11024 bytes
font_02_sfnt_off0000e158.bin
6bc70120410e32ebed2477bb34849e1ae6beaa1ca05a78aeeda2d77080116bbe
pdf-font-stream PDF embedded font (sfnt) at offset 0xE158 15448 bytes