Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0ea9907570a0c61…

MALICIOUS

PDF

84.7 KB Created: 2021-08-17 19:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 68a9d891a45d231769c54c5921aa7099 SHA-1: d58e2fe7c75e26bc49d7c2dbad94886a4a91febc SHA-256: a0ea9907570a0c6117eb9a5eacf0adef50e6eed9d653512a2165e41de79d6ef3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many of which point to compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607602676fcc5---27793707755.pdf
    • http://nappsa.org/userfiles/file/xibolesozefesog.pdf
    • http://rszm88.com/upfolder/e/files/20210806065852.pdf
    • http://www.allatpatikapecs.hu/images/file/97022465403.pdf
    • http://berbun.com/user_img/file/finasorilekisazafe.pdf
    • http://www.asap-recruitment.net/upload/file/48817834995.pdf
    • http://seamacros.com/upload/file/23699591854.pdf
    • https://didacostruzioni.it/userfiles/file/noxajazewugasuvo.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/3p7nj5jdrlojersq7tsk8s93lt/kenamoriwesawavegiwoxevit.pdf
    • https://pet-fashion.ro/mm/file/8186647116.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d91e10cb0b---nimota.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/0b38936a61cfb9807b196838829bd4e5/kesiligezazilej.pdf
    • https://pacie.vn/web/uploads/files/zugobada.pdf
    • http://atenngo.com/admin/sites/site/documents/58635386433.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/0544c06ca9c4d1474616e410a675d9f8/masozobatikisag.pdf
    • https://facade-metal.ch/ckfinder/userfiles/files/23180370852.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daa05daed0e---muropujesafigig.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160734889bad18---winiruzaxogikofipifar.pdf
    • http://skolicka.eu/foto/images/file/piferojubepiket.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/f93e74a2957200ca0596e9cd3b7f30e7/62560273981.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/8c5690e209341ef6f801931154d0f63b/58293382724.pdf
    • http://kingsfinancialconsulting.com/userfiles/file/vavowebesefufugamuf.pdf
    • https://mk-promotions.com/ckfinder/userfiles/files/pewifowabowitud.pdf
    • http://lmleadmanagement.com/userfiles/files/3156350913.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/1400fd1e42300e3a2d9495fe57bc9d4a/zanupuvofefosotunoru.pdf
    • http://carszana.com/image/upload/File/78125661707.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=apostila+curso+auto+maquiagem
    • 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_off0000deeb.bin
b3d8b70177d74cf0fed124977bb6d49bfae630d4752944743df0e25670b7988d
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEB 20776 bytes
font_01_sfnt_off00011159.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11159 16792 bytes
font_02_sfnt_off00012970.bin
50c909f40a6c4f0e8b2f87d9a2a5e7fc069e3b45a5822be2584cbbdee1c9038a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12970 10840 bytes