Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7e68339c3a6b85e…

MALICIOUS

PDF

68.5 KB Created: 2021-09-24 14:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7fb6e5578600d8ea6ea972bdf7fd62a9 SHA-1: f8fdc3f954e44f422a4a32b91186bc0fbf94019d SHA-256: c7e68339c3a6b85e66e52b6dca8320719c2533f44a64ef2b4bbd0d027965c5ea
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous other PDF files, many hosted on compromised websites. This pattern is commonly used to distribute phishing content or further malware stages. ClamAV detected this file as 'Pdf.Phishing.Trojan', and an ML classifier also flagged it as malicious, supporting the phishing and potential trojan delivery attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://seednseed.com/admin/fckfiles/file/losojarilexodoteta.pdf In PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/fasagelokuxadopikafoxemup.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/14999714041.pdfIn PDF document text
    • https://mkontakt.com/dat/file/xojupevadaxolabagomuj.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/1sa49fl31fduarc7vs42l4ek75/90699622732.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/95533578982.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16133b21494867---mapawepegesinofare.pdfIn PDF document text
    • http://turnyras.lt/Files/file/jukin.pdfIn PDF document text
    • http://pi-consulting.ch/download/nopapamoxebazutebamunoded.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/savupivamesazazari.pdfIn PDF document text
    • http://kids-ex.com/images/blog/file/34417035942.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404756084a6---gawepidarovude.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/sujekivoxozovoladu.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/94163728266.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/9228282442.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/42199552140.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/75001254253.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/wesevugexarosufanizowal.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16144ed121d25e---lasijasepaxazasigupuxal.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddbbf7333f---82329912789.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/36772808990.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=guitar+scale+apps+for+androidPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/fagaselevukikok.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_off0000ae71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE71 10752 bytes
SHA-256: 7b399a0c8ac14ff1ba5b10a2ec9b1185167e80879bb7954c0f2ef91f769e5dab
font_01_sfnt_off0000c74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5E 15012 bytes
SHA-256: ea4ab380b14811f0f9a9f4b3009ece9de2c3549022126c1f466c56bca130d162