Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f3d03ff115aa894…

MALICIOUS

PDF

79.0 KB Created: 2021-09-06 10:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a9435c32d5d24739c523cd2ef322a668 SHA-1: 13cf2e0eae40f2b0a41de9230c2dc25bfa7aadd8 SHA-256: 5f3d03ff115aa894716334533d59f71fcce89d2f06a7c49b60a588d9b1895b6c
164 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a 'download button' lure and a link farm pointing to other PDF files, some hosted on compromised CMS uploads, suggests a phishing or malware distribution scheme. The document's structure and numerous external links indicate it's designed to redirect users to malicious content or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sdhouse.info/ckfinder/userfiles/files/33949398933.pdf In PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/dipugeda.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/bidalugufum.pdfIn PDF document text
    • http://baove24h.info/upload/files/vimazefida.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/xetawuxozokalimal.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/32861871306.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/lejijebomul.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/7601472023.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/69065046101.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/70210590151.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/rebirizob.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/vubukibiwit.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/11830692718.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/71380268887.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/pawaxirufa.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ca95c59a1---73158825035.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c27093c940---14630276917.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/borimepaxuj.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/wofularejifulajufogulu.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b7308495520---bukegejemimitanumopixexos.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105019a2d995---migadupesonofig.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/gapoxomimifavunatewagob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=venn+diagram+blank+worksheetPDF 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_off0000ce83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69A 10980 bytes
SHA-256: ba2c3790d17ce6c180dd8c4dad265ed1113402746264ac93b68ef36a7e7310ff
font_02_sfnt_off0000ffbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBF 17812 bytes
SHA-256: 59926e932531b336fc9489e2cd638c5d0c1543f74705c783edce41d5915d2b29

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