Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ff5deeae2a03064…

MALICIOUS

PDF

72.0 KB Created: 2021-09-12 19:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6d7fec5f5bd516432bbe5bc587e9b11c SHA-1: 25e0633f2fb73cc32d9d0b07a25ce90d55801ef5 SHA-256: 6ff5deeae2a03064a5938c900ec1382c9ef50d04de989b311fd2aa5ab5e4d5b7
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 are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is unreadable, but the heuristics and URL analysis point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ip-pharma.net/data/files/xiwuzoruledil.pdf In PDF document text
    • https://mosallaesf.ir/uploads/ck/files/53261729826.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/54573267774.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/zemenugesejanuwowajawok.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/22403713476.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cafd1f7de---17652062978.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/xiwipipedojowawepaliga.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/8895466161.pdfIn PDF document text
    • http://kammed.com/userfiles/file/julamoz.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/susevafametujenasolud.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131acb2c63eb---vulutikupew.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/tamurezovotipusipalusod.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/65374402382.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210902043652271.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a18a58b702---zirizun.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109031447293950.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/jinenata.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/55951273.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/piwilopusovurozego.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/lubalamefuvumetesefebum.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/64474430885.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/kewalom.pdfIn PDF document text
    • http://thepducphat.com/upload/files/saxaxujebegatisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=thermal+cam+pro+apkPDF 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_off0000ba27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA27 15848 bytes
SHA-256: 4b0b75520b9b26976d37d6dd3973dd84c4da1df839aa0e621883b75707e57fd6
font_01_sfnt_off0000e315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE315 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2C 10232 bytes
SHA-256: cef2d62bf9cc6418f8110f26e1baeff9ecba37f9c4a8bf3f3dcb39dd0a5a7156