Malicious PDF — malware analysis report

Static analysis result for SHA-256 433f50dc66e6babd…

MALICIOUS

PDF

87.2 KB Created: 2021-09-01 22:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0570d13761f503f503d8d3a2174ad12c SHA-1: a5fdb888b8d8386f4e3b396b0d6c12820e55b8aa SHA-256: 433f50dc66e6babd505d86226753e78047db4d324acc81e0531fba77f8db12a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160864501ea255---59225279712.pdf In PDF document text
    • https://mahae.hu/files/files/dutosaduperovijod.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/e9210b358c12330be645492f1e6a61dc/simaporasafikaxurisurule.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817b819a6b6---zowebojeteforuk.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/jokobudunijusisexejolegu.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/gosoneluzujepin.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/83176286943.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/205e3ec70c224fab666e0b30217bf402/magasewerunow.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/tljlj4f3k5kpc757pqqnd0m26f/nexezezupefiwosoviroxamaj.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160b02053c1066---nopevowe.pdfIn PDF document text
    • https://506hlapeta.com/files/file/86197073537.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210608_405035B6DA131155.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/dunojitejusavor.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/6362184928.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/147c778e1040b0efe76dacd9855c1f2e/32565849555.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c15efc89a6e---16909657663.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/32866677353.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/fimemodaretubutaraxegubo.pdfIn PDF document text
    • https://ovalpolycoats.com/media/13741917742.pdfIn PDF document text
    • https://12tiga.com/contents//files/34095353443.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=for+the+same+meaningPDF link annotation
    • https://mediaget.com/userfiles/files/63453239402.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_off0000f323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF323 16984 bytes
SHA-256: ce28b50e85f387a8d5f6a8ea61c3da8a79a3bcd426cd9e6a4c64a6224676f143
font_01_sfnt_off00011eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E1 10488 bytes
SHA-256: e5735dc044815ae03fab1b84714550377c046bf23db76197bfa943b149d6b673

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