Malicious PDF — malware analysis report

Static analysis result for SHA-256 5699d65b45dbc172…

MALICIOUS

PDF

80.1 KB Created: 2021-09-11 10:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d20cd7c331284462399e27195616d4d6 SHA-1: 5a5a23a3214ce9b71051adcb6c813a9ceddf053d SHA-256: 5699d65b45dbc17257e6b39abdfb4d9e905289800e6025c446ba4be5040dde95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://broadcasthub.com/ci/userfiles/files/gomuteg.pdf In PDF document text
    • https://associazionedynamica.it/uploads/file/tebizowali.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/wixeserupinozo.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb4bd39393---31095617695.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/medenuvowutisewu.pdfIn PDF document text
    • http://konberdbio.com/upload/files/zibutojikevow.pdfIn PDF document text
    • http://rinsacars.com/files/others/63242802081.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/xaziramone.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/fedawokutej.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/grj521cp67fek4bpfrlcrhg1ft/79551397514.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/femijawedajuparevakok.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16130e57d38f79---82549273404.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/89914612828.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/59544554049.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/medoxafesijade.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/wimusajosilijujibivaxor.pdfIn PDF document text
    • http://thaide.org/userfiles/file/vegimiwebimekizogeka.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210902180612.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/54862212624.pdfIn PDF document text
    • http://poliinc.com/upload/files/wobotoboxemoxebeperave.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/ronoxukejukebupevuz.pdfIn PDF document text
    • http://iviltra.lt/images/files/gisanov.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/fiwal.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/32478378225.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=outlook+android+syncPDF 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_off0000d58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9F 17508 bytes
SHA-256: 36040172136bd0c2a72aa632b229d949a331e4255a4d240b5df8255fd79844cc
font_02_sfnt_off00011b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B08 10564 bytes
SHA-256: 0c6827aa4e6b3d90c528387a1609b896944c1fe303797bab77a14ebf8310b035