Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef0988ebe1ad01c5…

MALICIOUS

PDF

85.6 KB Created: 2021-07-26 12:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 091eead69e06e170d2f1d78c418f7dbf SHA-1: 52e0a92b21f75b3fd565a591f3f9952d22747ea5 SHA-256: ef0988ebe1ad01c5842c564f4900fe5d0628fafc8688f3e6c0326ce406cb56ca
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to potentially harmful content or for SEO manipulation. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sportsht.com/userfiles/file/7070835830.pdf In PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774f4a50e51---rilorobexenakuzut.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/79476252320.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/12433800363.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/29186116806.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/kizafokedufijelerisalanid.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/59212425329.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/7cec318b35717d8dbed87c6d9c9b99b1/novimanusotixurek.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160930e5b9a771---vagupozakeguduxivu.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/xoxixudefebovabe.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/a1pp1smttjv4i9vm136p0nh0bi/davesudofituzuf.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/29843795907.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/6e51190j9rg7i4ith39afadjba/34158779282.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/pezexomogada.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/a2aae9a4ea570c5e43eaa9e711a14fa3/18548969809.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/natotubuwu.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/55373402300.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077aab85e99f---23032542276.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/fizip.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/xefox.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075bf1a0c334---juvab.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/d9g1plin12moqshv1lfkj0tfqu/bijisomasejuzusukizenifi.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609113f224edd---3275346559.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/todozasizasixetasunepi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=counter+strike+1.3+download+full+freePDF 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_off0000db84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB84 28796 bytes
SHA-256: f5e160ac43950bc7edade1ed3a99cc3b9c6eea6dd1bf7fae3b3d04a976cbb9b6
font_01_sfnt_off00011514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11514 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2B 10948 bytes
SHA-256: 06cd22082a3cc0c5a4ea0b9b47106afb1883aaa4632d246a50545519489f74cc

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