Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee3ec7bd541bd34b…

MALICIOUS

PDF

84.0 KB Created: 2021-07-22 07:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a9b44572dbc47e2de9e918f8f33f33cf SHA-1: bf728646923807354148f072ef3a535ea15c758c SHA-256: ee3ec7bd541bd34b41af67fbb1a342bb164aa332fd20656ecf26e669df383866
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The presence of external URIs and compromised CMS upload links suggests an attempt to leverage these sites for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://evergreencans.com/userfiles/file/54140844285.pdf In PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b3edc58d0---tazaj.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b555792618b---wuzox.pdfIn PDF document text
    • https://apronorte.org.br/ckfinder/userfiles/files/fufonojuvarenopobi.pdfIn PDF document text
    • http://domplus.su/userfiles/files/24413709906.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/b0a3442e45f3bacb070ea1e36920658f/35719094960.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071814c205fd---58852956001.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d9f38f2eb72b07acdac76a6b0570bf03/64158436989.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb03fb6cc9---jesolafiwaviwomofadas.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c49c6b5c19b---kizutoratav.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/37475134520.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/vatuwuj.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/shnt88t1m7uuqkg9bu17gi2ab1/zifetob.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ef6e9c704---fenidafobinunu.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/572925100797aebd4792286d1ef86135/50907256296.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7433535fb---39370939670.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/repesixunijegofirajexu.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/35546746326.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/sapugovuv.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/83598670283.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3acb72c80---53807327929.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/5dd9972baeeb44834cca0a277e04ae81/femim.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085b82017f4f---14465449250.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/93669332307.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210710132302.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=35+usd+to+indian+rupeesPDF 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_off0000e6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B2 10648 bytes
SHA-256: 4c980025f65558812c6e491b5df4712423d17790463387d9b59cdd2945816952
font_01_sfnt_off0000ff2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2C 16180 bytes
SHA-256: 5c3ee3dd857e9a526cee28f4fa60e22c1231387f18e864947dec764072f014c2
font_02_sfnt_off00012953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12953 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1