Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3afddda8343edef…

MALICIOUS

PDF

80.4 KB Created: 2021-09-05 19:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3f69d2c6f806bbd772f3985dae302a17 SHA-1: 241177bbceff7ad0d9bf6cbd5a77a5c1f85ad53b SHA-256: b3afddda8343edefe086f62d36e8c15fad3849257fd5087580cb75b8682b8326
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of external URIs and the link farm structure suggest an attempt to lure users to malicious sites, likely for credential harvesting or further malware delivery.

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 http://ck-kutnahora.cz/gais/image/file/kisasad.pdf In PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/54488209215.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/dagulup.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/57343f5d2fddb473b3376b48a1735c7a/petipaxilitujonasekunexu.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/jexenewukozirire.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/pukozujubakawutokugurubow.pdfIn PDF document text
    • https://banghenails.com/upload/file/gibipapubaj.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/6e0cffbd921786e7ff4a2445bf208180/vofukujotigafep.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site//site/data/files/60179626464.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160884efd4ddbd---bijujebiwapoponizuxamuwe.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/7e4403c09b526132f52e30ec7268f884/mawog.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/ximubugunuzixijasupune.pdfIn PDF document text
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/pasegiwitefudezeme.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/69106447414.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/184f41c95a51a8102583e23430c5c8c7/bujipadisulera.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/fa79134aa32b0ff044e3810794c663af/bisonemes.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1609239c24dbea---63464176964.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/kujimupoxunefagiveritad.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7804b673d6---71996117327.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/26453043392.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bbfc42cef---43952089374.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/vikik.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/moxegavewitiberoxalome.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/843a42a22ce9d7781d78e75366239816/wejowofonaravudiradixoze.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/k7a3aop6vamiap66i3la1ioni5/dusinimitunu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=materi+enzim+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_off0000d790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD790 17500 bytes
SHA-256: 07f6eb71e68c4e59da782d50d0d06e92b3ec817a51360f5513c17d03820f0d47
font_01_sfnt_off000104bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BC 10380 bytes
SHA-256: 3477c771d4f895a1d8034e26c4091a347855d5481d5fea702151fa1e06b4e028
font_02_sfnt_off00011c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.