Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e4b39ea71ae798a…

MALICIOUS

PDF

83.5 KB Created: 2021-06-28 15:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e84ad4f1060223d296f1ce0a94bcebf SHA-1: 49dc5d5721b302d83f2d240f28dafe162f77be3a SHA-256: 3e4b39ea71ae798a1a634d3b330454f777b42fd5844c41d47d4e5e2106ddaf59
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm with numerous URLs hosted on compromised WordPress sites and disposable domains, suggesting an attempt to lure users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://philabc.ru/uplcv?utm_term=ideals+abstract+algebra
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ef2959076---rivatisozuwitunawij.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8d988c964---fukuwibituw.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16080ccbaa90c1---42983273343.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/9916pi6vrkmq4iv3fk9uni37cd/95623352211.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/73200bd49c6a55557e7e177937293dd2/gezekuzipevotesulovufegon.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c922517e906---71141180446.pdf
    • https://p99.tw/pro_pic/files/4313593191.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608630fa5dc65---lujedifusesuligari.pdf
    • https://topclassgreenery.nl/images/file/57535618081.pdf
    • https://ipic.vn/userfiles/file/9823128724.pdf
    • http://iglozawiercie.pl/zdjecia/file/9761938071.pdf
    • https://healthmatters.me/userfiles/file/xugizapekenamakewipe.pdf
    • http://praxis-greve-polley.de/web/editor/files/23902744793.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03262c7524---59787472450.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/a096cad6d99e55ad06920827ef3e9961/50395667341.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/61lfqj9lqah9j5op32gv3hmbob/buwozuxajademux.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec3c0efb0f---22063638596.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/nf40db9nv4713j11ogd3b2bh47/kinepamulap.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16090614f8de73---nexol.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e25bd0417---18895407882.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b467bca5a3b---74468408773.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7e7cc95ac---nagotise.pdf
    • https://swift-tw.com/lcc/upload/files/42660899428.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_off0000e24b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE24B 16792 bytes
font_01_sfnt_off0000fa5d.bin
c8b29ba8fdd2a347492f717abce5e64978041746507b5c0464112df9b2a2f0ca
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5D 17852 bytes
font_02_sfnt_off00012992.bin
c835fe5d8c37f7174bd608c3d4ca299607ffed3bb203d6b06e4d029de863d933
pdf-font-stream PDF embedded font (sfnt) at offset 0x12992 10320 bytes