Malicious PDF — malware analysis report

Static analysis result for SHA-256 3481a08006dc6e6f…

MALICIOUS

PDF

109.4 KB Created: 2021-06-28 02:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e96a9fd89039d04e73f4410e6ac23514 SHA-1: d4bd520af32ad6dd5645ac1ae6a7fcc8c68bdeef SHA-256: 3481a08006dc6e6f6ddfc5873ef9c544afdf9b2132b17051ef991eac980efa07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics reveal that the PDF contains a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution lure. Although no scripts were extracted, the presence of numerous links on potentially compromised sites indicates a malicious intent to redirect users to harmful content.

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://daiichitravel.com/uploads/news_file/58466440882.pdf In PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/10579b01bc9c994e5a01eccd2832dc98/7675045483.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/vixif.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/d7c65d137aca120c2f6b7845bdf3158f/tovulakizajuluna.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/uc072dst8v8vdnmgodd7tlufu5/58134410167.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/ca683c19f95462da2732a48b0cba7e4a/45281843126.pdfIn PDF document text
    • http://terminsk.by/pics/files/53142506445.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/26269544569.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/57782860488.pdfIn PDF document text
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/86698898770.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082596c1da8c---28067472143.pdfIn PDF document text
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/15566425838.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d17ea4bea1---begipabinirowilirolojojud.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/ccd7261013029a2a054cf9eab10b4b73/16423295088.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c94183b1cc9---33874139165.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/f02a1b66f51bb7148557a056c90074fe/jasobole.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160ce07bca1f9b---wutojuledenijojiwulak.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/gepajivujetera.pdfIn PDF document text
    • http://davcpundri.com/css/file/72728137161.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/9a481ae5d5dcc700b71db270e40fab4f/76063188297.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cff0b5b527---nowaxekavaputixew.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/fb259431dea272e43a8eab0a5da15dec/45522480826.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=it+stakeholder+managementPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e4f0ab6b539ed66786ceff3da4eb8c25/tejefisada.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6624ea07c8---53501321851.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_off00014cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CB9 10648 bytes
SHA-256: f6337c8eeda5441c7e0105ca7eaa00ba8c9f578b324634d67fb343f0769f218f
font_01_sfnt_off000164c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CD2 16840 bytes
SHA-256: 3f265fb2216502cbc785b72d63924752bd58f94b61d41a3a05efdfb4994db670

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