Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b03cf024483d557…

MALICIOUS

PDF

113.1 KB Created: 2021-06-27 02:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f28fd746ef0146b0c2778fc983ad3009 SHA-1: 47796520d2541268d16d1c5c48a8b6a0ee88cae0 SHA-256: 6b03cf024483d5578a9e40f54e00b76a223acfb869fe6b4c1d6938f6078dd8bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://oniceh.ru/uplcv?utm_term=domicile+of+choice PDF link annotation
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/iuo9455kgfdnjv7v91spted84s/komakituzaw.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/31701700371.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9972a78c8---mufefefifibinexop.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/59152935947.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/388609d132a92ab134f73c0bfa431a0e/21604195998.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/09070a504ef168e00f054ce5c08a4b18/nezukemafe.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/csme9hv0lefnfvrv7jj25kq5ns/3064842255.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/62140205379.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/3946156c09022a1c31e30fff4342070d/881288298.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/a0rr6v3p0m6lm386bu2p7deghd/20417302336.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/2758b1cf3ca65aaef8e33fa10cac1c54/zakavob.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/xorevanawebesomifenop.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/uc0pciokoghmtskfqb1o52hgc0/47082200756.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080129b354e2---75104071542.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/fupopovevexajumenuni.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/serabafubipenanuxitupije.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/d04a62aea263f1b324196ba1d6128d9f/rijojavejejaliwa.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160be80cf87263---vuxugij.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/46567998720.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac020215d49---13194373918.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/sabebet.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944038e4c63---vevevawafivirapusabe.pdfIn PDF document text
    • http://berbun.com/user_img/file/31985496969.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/bj2hm9t62bcqd4agd8klosf5hb/65375032024.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/tiwetenujegotipajesofog.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_off00015a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17295 9968 bytes
SHA-256: 8562675260ddc9270627ea21d21d5f761b391db770a5ad8a9fb4c52a52327dbd
font_02_sfnt_off0001888e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1888E 18252 bytes
SHA-256: 185456b405196008ae5e38820d6058170f9a085a89e864da2883f3bb49dc1304