Malicious PDF — malware analysis report

Static analysis result for SHA-256 790d473d76ab838d…

MALICIOUS

PDF

84.8 KB Created: 2021-07-09 07:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7c9dda0d8fde4744c7944257e3216a41 SHA-1: 74dfafc599b6770abd575fa2cf12224339548586 SHA-256: 790d473d76ab838d034e3e84c3b4e5d8839ca444908ca3ec314cce5a842efb1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous links to PDFs hosted on compromised websites, suggesting a phishing or malware distribution campaign. The presence of 'utm_term=refund+form+template+excel' in one URL indicates a lure to trick users into downloading the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b8f16a2e7---tenijogugorug.pdf In PDF document text
    • http://wagnerpc.com/userfiles/files/bivajuzewexewapibunuko.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/4ge6hr0cn9qh1fgkmjvhv2kie2/62809409402.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/71458716870.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/917kr17rroo0rtfmugtr8mkst2/80801287132.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/28a744154c94f44435a8a10e2e232f6b/38129133650.pdfIn PDF document text
    • http://bethelcommunityone.com/clients/880032/File/92602798450.pdfIn PDF document text
    • http://monroehighwildcats.com/clients/40160/File/26163967537.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eccf01606a---12712423596.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92939997cf---76420389325.pdfIn PDF document text
    • https://morabia.fi/images/file/65453301271.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607579d8ed401---wudokufugab.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e318bed7c---lefuf.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/3166313e4a0b5758ebdac5e170e8a516/99086145372.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc796c9287---jewuzexejutukuxit.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/5f27a160dd3acd3848cd3f04e1f7a920/7900140276.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ca9ad884c---35039754205.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/1c44d3dee5dec98cf5004ff0e43c35da/sipovamotasebonizaduxuk.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/banaxanoma.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/7fe6edf7f20aceb60911b4291bb28bb2/pinukimokelewetigutekoko.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9aebe2e5ff---bafofonazazunajowagu.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/serizipetisesadibevulogu.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb2951fb2f---femagulusiloj.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/sumitamuzomukuvupe.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/gorisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=refund+form+template+excelPDF 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_off0000ebad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BF 16192 bytes
SHA-256: 1e1007293c2e6f512233f34e7eeeda7056b7137da1ba435383ffff3bf40b9490
font_02_sfnt_off00012d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D36 10768 bytes
SHA-256: bf9963f34400fbad2187abded7699162e25de455502e079f59ca1c8a51f80b8f

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