Malicious PDF — malware analysis report

Static analysis result for SHA-256 b86a0b7fd516be26…

MALICIOUS

PDF

97.7 KB Created: 2021-06-29 13:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c87f6fa049125aca3cfb3de5187e2f30 SHA-1: c04c5a1aec4bf7068de9af8ad27fff597c817d78 SHA-256: b86a0b7fd516be267894978af195b7f15a3cfccd2eee0bd2805d7bb22c38fcdd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a phishing or malicious redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious sites or download further malware. No scripts were extracted, but the structure and URL patterns are indicative of a link farm used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://crysiq.ru/uplcv?utm_term=characteristics+of+a+godly+leader PDF link annotation
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906138145c6---21483664500.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/rasatigekepozes.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/kepomojobevob.pdfIn PDF document text
    • http://ubest.ru/images/file/7826239506.pdfIn PDF document text
    • http://polletnv.be/uploads/files/dupimiwuxeku.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a08270697d---bivakoduxowaxorujipiba.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/sowuvapujum.pdfIn PDF document text
    • https://hirurgija.me//files/devuguxofojujik.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/f91de9a5bd4b3b9f711867adc12ab28d/25179175141.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/bijupexuwenimejorejisin.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/830078916609e35ef3d0b8.pdfIn PDF document text
    • https://goldenapp.net/file/63023268052.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/15248111628.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/8990277083.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/figemozusupamax.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608106f74438c---jisojuvuzetusadixadodeke.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/63fc54d1fcb2213f6b232156d5abfa38/vizapimujukus.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/bb799e1c08663ef300c8199fcdec269d/serekegeletivujes.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/m4nt9ac1e2muhrd65i3i3pd2r6/82930360763.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/732075014ce1b67bb981b52247c5ac1a/jigewegubazew.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/jasutatuwivalik.pdfIn PDF document text
    • http://mientrungpetrohotel.com/users/files/minowozuxumesipavije.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_off00011dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000135d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D5 10796 bytes
SHA-256: d4b45e2b16dd7ae30f295e50a22a563e110d2aee010d7b521a5c0c143b6aa909
font_02_sfnt_off00014eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EAC 16696 bytes
SHA-256: ca3219e70725b626e374037ee02857f8c8978aba834aa226e3f1b6efa1f3d1d7