Malicious PDF — malware analysis report

Static analysis result for SHA-256 39575e5186245ce9…

MALICIOUS

PDF

87.1 KB Created: 2021-08-13 17:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c937ca57d7ad91edce8d7d8eaf9206b8 SHA-1: 8d4457ec8d53964591cd64cb27f3ea1a6d96b0aa SHA-256: 39575e5186245ce921f0da3991c0f5d18bc1db9754da076beb36488b19f9c242
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded URLs, many of which point to compromised WordPress upload directories. The ML classifier strongly indicates maliciousness, and the presence of a link farm suggests a phishing or malware distribution attempt. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 5

  • 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=steve+harvey+still+trippin+full+movie PDF link annotation
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe59e37514e---wozigelepetuvopala.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/23001881998.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a8594647545---najezalokuluzizakesopaxo.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160730229a550c---bigowowunebumazugik.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/buvisalirer.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/tidowonuxul.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079a0af80176---gujaxixanefi.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/34313615639.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/xowelolukoxoxuvidafatewom.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/816c119c0f8f8fe0daffc002bb86080d/9405362008.pdfIn PDF document text
    • http://domainecomps.com/documents/files/66009677200.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608758a8eb3fa---zevagesi.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/wamin.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ddc0d8216e2---23328390868.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/62819089583.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/15189459329.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086224319703---zolewusunomoko.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075e0ea580fb---29505117892.pdfIn PDF document text
    • https://hgb.se/filer/file/34986536223.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/94606236606.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d7a2914cc---zuvigonu.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/ehfj7lhl6katjtb7cksbttp3pv/89013507427.pdfIn PDF document text
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/mebudovijemazogobe.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_off0000edc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC4 17840 bytes
SHA-256: 7e6a981ae825bb10dc9959e3625a024bdc8bbd81ed5d1bc298b3cfe7848c597e
font_01_sfnt_off00011c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AD 10976 bytes
SHA-256: 947673cf54fc00a6514fe697cacedcb07ff91f7f286eef9a2bdbc070b8854d67

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