Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f685b6ad44ba92…

MALICIOUS

PDF

83.6 KB Created: 2021-09-09 01:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 30488e006ac18c44da611c6b920cc32d SHA-1: 94bdf43301817d0c4822793dedf686890e976a51 SHA-256: 43f685b6ad44ba92aa022b96a03287c0229a52e3efa377e09ae41da230b09ae3
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a deliberate attempt to create a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

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://medvor.ru/uplcv?utm_term=best+android+reader PDF link annotation
    • http://mindentudor.hu/userfiles/file/9726977789.pdfIn PDF document text
    • http://berbun.com/user_img/file/37234277689.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/zadidimuzule.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/38013734915.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/42713199552.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/51034011425.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/winevidewifudipufomisore.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/patobopasikesamimi.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/edb4cc8bc9e64662a85035db61adba38/pagepapepimepukegibufituv.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/tefejegilajinenizewa.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161376f19946e0---15053953369.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210905130905_hny615.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/lijifarubepagumopaxalotor.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210901_211039_2498.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/warimos.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/7983514324.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/91436997934.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613912cbc6619---83856144212.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021090903104764.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/73060449508.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/lefetit.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/fajase.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/dibeburadibu.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021090711192873499.pdfIn PDF document text
    • 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_off0000e20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20F 10248 bytes
SHA-256: e17563c9816062234d3214ff144699f586f2ebe0c28fcebb9aa364ccc7a1fc1c
font_01_sfnt_off0000f939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF939 18088 bytes
SHA-256: 6262b1812d8073a30b27c0ca8da84fccea2e6038e3e24d71dd9d11d473123f2f
font_02_sfnt_off000128aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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