Malicious PDF — malware analysis report

Static analysis result for SHA-256 578d801e05d6b815…

MALICIOUS

PDF

79.3 KB Created: 2021-09-05 14:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 595fffbd2fb17d4b7234e8e963535e10 SHA-1: 8bf2a6f92a583ed0c93520489ac08e7ae2a05783 SHA-256: 578d801e05d6b8155adce20c1506e4fc5ac2c4e7b7615de38637410cd9ac3a8f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, likely for phishing or malware delivery.

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 https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/b0fa0c87fd9cef602f986dc400fbdec2/kakebilef.pdf In PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/kutugemogukudasazut.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/korezilutowewazukeleg.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dacb28213---zaxubanites.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/19316202365.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/roxosarazasak.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/38179254748.pdfIn PDF document text
    • http://aa-nusd.jp/korado.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/fatewesefil.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/diridoludu.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/80666462801.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c8f2b0d98---44896113988.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/7beecniojmqlpss7rd2kb7maj6/nutedotelibijenekulutaleb.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612aaab99717e---sodivigi.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/96132939399.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160779c0c8c56c---76249930335.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/lopabesejur.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/8e2d7457e7e00892f80cb1475ea4c73b/13837376020.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/lonovuxijadomejo.pdfIn PDF document text
    • http://bmcsteel.com/uploads/baiviet/files/pafamewebupen.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/fjm3n3t9f76ev3j8jcstn1i69c/vebomovojiwixakupezelux.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/1deb652335127f6b7378a88380f84e83/lezasobekoxaveki.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f53cf93dd2---51770874185.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=que+son+microorganismos+de+monta%C3%B1a+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_off0000cadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADD 11280 bytes
SHA-256: eb60d1f2b87d4c4dacbdd448d964ed17a4d8a474336fa55156c7a21843d98071
font_01_sfnt_off0000e4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FF 18760 bytes
SHA-256: 261a1af08c052a9d70d721d2c2df1b848a05734c4caaac1191349cdf6e91e056
font_02_sfnt_off000114e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1