Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c67eea5787121b…

MALICIOUS

PDF

76.9 KB Created: 2021-09-04 11:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 831510ecb176b640abfdd4a0874b080e SHA-1: 79e5d6209d1040d255d200ab0baec5927244f404 SHA-256: 83c67eea5787121bc38db3ee3643fe6cf68e3d855db955c87c932782840b8086
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/7c44a0bb0b012a6e2213de00d7dc8278/kurolabixun.pdf In PDF document text
    • http://geometramaurotozzi.it/userfiles/files/jokiwosokalowon.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/98e1af394d199e1db855b3b342e344c9/34127574198.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/9d4d7eac2157d01e91f2c7fdeaa03d52/rurakuzid.pdfIn PDF document text
    • http://npas.ru/pic/file/nubenepifupezikefezu.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202106041032181423.pdfIn PDF document text
    • https://teamcode.net/upload/files/gobodofobitot.pdfIn PDF document text
    • https://petkasem2hospital.com/images/upload/userfiles/files/4103726748.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6da03d37ec---gedegiginepadirulifo.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/70dk3inuf1vb23m7pvf6dsq30v/28038382047.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/banafulejexutobuteliredis.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/3787f372f48c149949c003c7e230a28e/visajimej.pdfIn PDF document text
    • https://invest.pl/userfiles/file/75096919710.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/30290586314.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/2d87eee6679a58047c677149b0a16258/kirufodokotexa.pdfIn PDF document text
    • http://kim-clark.ru/files/file/wurisak.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/5624930569.pdfIn PDF document text
    • https://medius.sk/userfiles/file/44141839674.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87ceda2ec6---najalumi.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/sb49cnlupm9lqvd60lqs4clg25/joxerabolipexowulu.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/38t35uk6epllbq4dbcbu3duqf8/46920748628.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/vepevisojeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=diagnosis+bronkiektasis+pdfPDF 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_off0000c8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C6 10860 bytes
SHA-256: 6de55a5980b1793c3936c009f27b8f23d84a4987ec656550a7ff5206209d88a5
font_01_sfnt_off0000e195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE195 17056 bytes
SHA-256: 0f4659a8ff12e4b1c61c1095335b96f22371bfa51d18e7182c7b50d662a1a5ae
font_02_sfnt_off00010d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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