Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5bef81fadc33dfa…

MALICIOUS

PDF

80.8 KB Created: 2021-09-03 23:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 403be0ca5b1899b8e1adbbc725c3016f SHA-1: abad31fedee261faf36768cd34e99a88ddbda56c SHA-256: d5bef81fadc33dfa533eed46f8ffc6211023234df7d3fbda931ae16707aa6cda
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to compromised websites, suggesting it's part of a phishing campaign or a distribution point for further malware. The presence of multiple external URIs and link farms on disposable hosting indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://drafthe.ru/uplcv?utm_term=neumonia+intrahospitalaria+idsa+pdf PDF link annotation
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/ca08baf401788ad7e1dab1d04a839705/wavozevinasutujidurisaw.pdfIn PDF document text
    • https://parkettworld.com/upload/files/47305298159.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160987fdb0f494---sulaxowirirasedopetugin.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb8aa488a1---46837347941.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607f84f0cd78e---garolazidaridawupanagugi.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/51150747887.pdfIn PDF document text
    • http://teresachild.com/upload/files/netibure.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/6ddd8f4d588cb04ca9987b3171cb1031/87521701682.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/56108542131.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/53995115017.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/bipusodobukukikefaxelebo.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/xosupedotuwukuxavifod.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/rvmtl72pj9oqmlld7vp80ejnjh/jubesuxejiwofuge.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607365f6b28d6---29633777137.pdfIn PDF document text
    • http://vuason.vn/upload/files/94116501035.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/47133228448.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/lolewekekemonalasapazube.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/mio87t16p391easkoafnhj25tq/81861715917.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115083a0b267---wosaxawabepevekomik.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/jikuvutolikon.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/4fe202727dd4c0a24a1e460ed115a052/powebupelixebikat.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e1094db34---74161184519.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c3994970104---patizawadofefofi.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/a77kuo9s002k3viivlb8imklm3/45504629822.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/67200474669.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_off0000d89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B1 10840 bytes
SHA-256: 31bef21428e3a6bcaaeb78c83f6aa0c35da9701b47ee0d3e8d002baa4b79d8ac
font_02_sfnt_off00010979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10979 17380 bytes
SHA-256: 2f27a39cb5d6b3b15ff8d9a4ecfc6bf469f1f9255399ed0342c1c7f4dae9c284

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