Malicious PDF — malware analysis report

Static analysis result for SHA-256 497463ce44b6f2be…

MALICIOUS

PDF

79.2 KB Created: 2021-08-21 05:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1d949566b41791957ee042273a7fd55e SHA-1: 4d3679b9938f9ad3775929e0319068bd8ae545f0 SHA-256: 497463ce44b6f2bec5759a09f8386b538eff16ae5c0f18b852ca4872b1a04e10
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be generated by wkhtmltopdf, and the presence of external URIs and link farms strongly suggests an attempt to lead the user to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vusefana.pdf In PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf7cceeb9---jonazor.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/tajorinoralixapowu.pdfIn PDF document text
    • https://lordoptika.hu/files/files/91104629382.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/56556827037.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/76961846437.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/36625439929.pdfIn PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/xovelurumalafizusulefizo.pdfIn PDF document text
    • http://abroadster.com/files/pupatilur.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df36735bd7---kirewof.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/a9b36d94186a7b7e655baa17b7439e96/ditazatejugomagufu.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160761a9845e25---6070462166.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/82936235053.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/v41e59vjvcvp496a86u32f2f1q/tidokozilililewakikula.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/kedexotin.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/64473732116.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/24122617014.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160957508dd6fb---39395525910.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a217260dc---42709710344.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210728_299B0A1AD874EB2C.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/46234771436.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606f57b297ead---mizofazibat.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/wazitemit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=loan+payment+calculator+excel+templatePDF 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_off0000d3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F4 10548 bytes
SHA-256: ac2f58d9080400ee0ccf29fe5e59aeaaeb97258261db51ab716e71ccd9db7b7a
font_01_sfnt_off0000ec0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001041c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041C 16612 bytes
SHA-256: 986f9b8d1f818076fa9acca3fec3aeb4939acffc9ac9c7da4092ee68605f1e90