Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ff8dd4052274301…

MALICIOUS

PDF

89.6 KB Created: 2021-09-12 17:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b8ac46d7e63394ff24b214f1cd35f59f SHA-1: 15d2a32f105f31a286575f93b34fc63f9dc3f148 SHA-256: 0ff8dd4052274301494129773858e096e968c038847fc544750f961c9078ff97
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and embedded URLs are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://crysiq.ru/uplcv?utm_term=harry+potter+and+the+philosopher%27s+stone+movie+streaming PDF link annotation
    • http://bijverhoeven.nl/uploads/files/59913214793.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391e2650a54---letiwu.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/a5b792694400f05c0f0da16b330a6ed2/91836687338.pdfIn PDF document text
    • https://carlojans.com/cms/file/tefevuk.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/lq1bac5hsfdkkni1u5n6ug76ms/84365627895.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/49762029106.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/tixen.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/86024880887.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/ee49753b06de45c6ed726b57d71e4cdd/lutanamu.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/51202209550.pdfIn PDF document text
    • http://spitalmoldovanoua.ro/ckfinder/userfiles/files/govuzuzakotif.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/vawaw.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/6c23443a5b318394c526e11a069ddbb8/76027752885.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/tazelazipivofo.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b463238de---52132894681.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/87792604474.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/34921129692.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/rijidutuko.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9cfd1aa63---konokova.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/66773212376.pdfIn PDF document text
    • http://syekp.gr/sites/default/files/file/12112798583.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/21748466874.pdfIn PDF document text
    • http://th-hl.com///upload/files/muluzewisi.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/sufekej.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_off0000f7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A0 11044 bytes
SHA-256: 06847f85bbcfa6388d0c42be73878d97084264a340dc310785319aac4a150c74
font_01_sfnt_off000110f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12903 18448 bytes
SHA-256: 5ceafbb3fd76f0d122bfa132281d62dae53c548248d4d7cbede80e3d511e51e3

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