Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2e15925ac47d169…

MALICIOUS

PDF

80.9 KB Created: 2021-09-12 22:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 55c659229d04877f03e6092f537aa3fe SHA-1: 61ff601c61fd31a7a267f3aca8b624625fdb0ccc SHA-256: b2e15925ac47d169c7139a2bfcd10746508ca5122cf6153beff48942f50176cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised or disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://cmrivestimenti.com/userfiles/files/zunesufanevu.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613731325af1d---vexusexalesesovidawuwul.pdf
    • http://behtarinekhodetbash.com/files/files/timofojemuvobibomijemupab.pdf
    • http://swissies.lt/ckfinder/userfiles/files/vokugusukugefa.pdf
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/96611671034.pdf
    • https://10s317.com/uploads/files/202109050157403223.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339a73723d0---vulujiluwubas.pdf
    • http://dinskayarealty.ru/media/file/furir.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/84049891e46a015deb66d5ed56be700e/64302782986.pdf
    • http://61kidsclub.com/userfiles/file/19186545898.pdf
    • http://muntepa.com/userfiles/files/810583036.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/7d4eaf1c7949aeaf7e8dbb33dcb9c51b/55059548565.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/161392a33bf784---wufefeziletubuv.pdf
    • http://islandpointfl.com/userimages/71818266447.pdf
    • https://mdteam.se/ckfinder/userfiles/files/7642729139.pdf
    • http://kiko168.com/UploadFile/file/20210902155344847.pdf
    • https://mimpishio.com/contents/files/gegilolibilojom.pdf
    • http://www.heksan.com.pl/file/49049989195.pdf
    • https://uzsienis.cvzona.lt/resources/img/files/17606635364.pdf
    • http://levant-tekstil.com/other_files/File/judutazerukukewumowil.pdf
    • https://mayersoffice.com/userfiles/file/7845416874.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/qshrh3khti2pil41smocfjf1qf/bifolitulibax.pdf
    • http://tid.vn/upload/files/85795061232.pdf
    • http://veganogle.es/uploads/ckfinder/files/zafug.pdf
    • https://smartcirclegroup.com/userfiles/file/57672250406.pdf
    • https://sukienmiennam.com/userupload/files/14346885649.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=dirty+vegan+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_off0000d1a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A7 16792 bytes
font_01_sfnt_off0000e9b9.bin
e6bfef1a12bf4c15fce1352fb6ebe891c49f04982dcc40876f83b755f49f9c92
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B9 20140 bytes
font_02_sfnt_off00011dec.bin
3c7cf4ae910f067f390c2d9aa186beaadccb6e9ff812e93b6524f39fc1729ecb
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEC 10520 bytes