Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4585de53ba3651c…

MALICIOUS

PDF

106.6 KB Created: 2021-07-22 17:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e6c9deffacbc124ef5d4bae8c93602ff SHA-1: 7e02e7e718fe13edf4bfea47b1232e664a3a319f SHA-256: b4585de53ba3651c8a92656ff0e37f6783a0069dde071ec9816301c85c20f3ab
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress sites or disposable domains, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kardelendalgicpompa.com/uploadfiles/file/xidufa.pdf In PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/duh2pn3ml31b7lo3k5a9thrh9r/rekilufi.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/86342982849.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac8d888a3d---40211745454.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/mosoxakadusavawarepofusaf.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160b62c3dd7157---7651971286.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a31721a052e---serogekokibosikigabiwed.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/nipob.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ec38c41c0---zidazuziwipajuban.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c67784edf84---14197587130.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081a1f950a6f---5188468552.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/bofibetik.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/1cc0cfab6f943db40de06045c3587993/70384725480.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/3iu95se1goec4mhlcr2ucbdc5b/76451420947.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607987e28ea93---46446164352.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/bebatewajif.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b3fc540991f36319b749300507dfec94/nusobovelelugobujupituru.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/dc64b6d999e8776ad98ed4c7be089f23/vafaki.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c36b9d1b48e---kunabufawumozosimabuj.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/58647070598.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/pilisawumitupoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=surface+and+groundwater+quality+concerns+apply+to+both+drinking+water+and+recreational+watersPDF 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_off00013a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3D 11652 bytes
SHA-256: 6a93af5fd219ae0d7a2f7866163c34153ed6e3b4361ba75deed24123f3748403
font_01_sfnt_off00015532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15532 17536 bytes
SHA-256: 1dd0e012f7edac307e682749b2d3443874e182410170aceb26208c2dc31a0c2e
font_02_sfnt_off00018365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18365 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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