Malicious PDF — malware analysis report

Static analysis result for SHA-256 f449e429821a35f8…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 12:35:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fc54c3b961e4bd4e6f6c3f14d0c751a3 SHA-1: 593f2b7e905f21489793892df56022779ce3bbf5 SHA-256: f449e429821a35f8dac33bfa7c4842c8b3598320cff2cef438e59caeb4ffd2f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload storage, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the presence of a link farm and the overall structure point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160871a09e5345---54759108977.pdf In PDF document text
    • http://rubensova16.cz/files/file/84897258267.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/sojexofa.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/xuxiputiwovifoleresigata.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ad661b795---paxolifiruzipajawuwisor.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/96754097460.pdfIn PDF document text
    • https://fuoriscena.eu/file/vixexewipitexa.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/42975850113.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210802184907.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/fasunivof.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cf347ad33ae---perujanojisifomal.pdfIn PDF document text
    • http://ausafe.net/images/art/files/49437409852.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/74d8b381c74135e0b2550ad65d92900f/mogofiz.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a06f8bc6c65---89334952746.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/6de1rtmfbru8nlk1sp78o9q7m3/vuvigarinalapupisonupuga.pdfIn PDF document text
    • http://dahchen.tw/userfiles/file/6564157368.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/kewifafomuromawerobikol.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/zenuji.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160853062b4583---xexidetafabuxomexenova.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/68695010816.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a717327d4b5---genolukotidod.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/26uoo33mdu3h81nigfu4me0gmo/lizolutomelaterarisinivig.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210815_6521ECB063058107.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/52015923144.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=router+cisco+1900+series+manualPDF 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_off0000d525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD525 19956 bytes
SHA-256: e351c70e87f2084b1c17de39a237e25d74ba9b4d150b79dacc87e743c2f34d99
font_01_sfnt_off000107d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEA 10880 bytes
SHA-256: 6c136ebda4fffbb2d85236a6296c5882f67b968bff6c9d22a05cc3215bd36eaa