Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff117c3a72484bc5…

MALICIOUS

PDF

78.8 KB Created: 2021-09-02 14:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 89d693423b1c65393f0c21a2130b37bf SHA-1: 3eae3cda5fec014c80b4f320ee2979956e747c95 SHA-256: ff117c3a72484bc5e22e2346225e2bc6f02a9fedc81fd374cf74d6a961a593bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, but the heuristic firings are sufficient to assess the attack pattern.

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://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/9gemq5on43ca15p7ib9bv4btsh/nirudizolaz.pdf In PDF document text
    • https://wupaojichangjia.com/d/files/gavenunusel.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/96792651795.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///55218525769.pdfIn PDF document text
    • https://ijpdua.com/contents//files/81777648155.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/tamota.pdfIn PDF document text
    • http://diamondsnspurs.com/clients/12200/File/21204315127.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737299e9142---lomoniwigobefuxokapek.pdfIn PDF document text
    • http://cpviettin.com/upload/files/roguredotuvajij.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/vejijirunen.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/7409563306.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/jevomirigigutegemojil.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/1e67ec7f9204c149082215eb9bf5a738/65253687392.pdfIn PDF document text
    • http://lejuriste.ru/files/file/bafofujevu.pdfIn PDF document text
    • http://xnkvinatimex.com/uploads/files/80880183862.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/97ed26aa505a29eda7170ee091832368/vefabesigujilifupakukurat.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/8poud9ae1t0rebqbq62pe31kok/sukewaduguwozanokobikulun.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/rujivipoguk.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/585ce28c5a3123a5210af969a8407f42/bufaz.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/g58mbskiqa9gnsg9sf444bb9is/54370793427.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/19242060321.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/59324289854.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/cb64d091b367bfdd3e5872e990666188/fexaximavobiluzujana.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ecb3c9f6d---nokezizedozomorexib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=cpr+and+first+aid+test+pdfPDF 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_off0000d031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD031 10356 bytes
SHA-256: 37f14bc9ce752da8bff4e1225a661a9f679906e816523e65088f7b98d79185b5
font_01_sfnt_off0000e7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B5 17848 bytes
SHA-256: be00ebf8dc6287148ec74d66043a7b2d6a866c7986a5d718493324c5498104de
font_02_sfnt_off000115be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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