Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2f2c47f8fc10b13…

MALICIOUS

PDF

80.1 KB Created: 2021-09-01 23:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fce6032c31e10939f11ccf1404f16f0b SHA-1: e559ac36a69d107c11fde61b14ff19a87ec48f1a SHA-256: b2f2c47f8fc10b1325b20e6dfa97d87b8146acda1b93a95feb473a3118cc3a07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution attempt. The embedded URLs and the nature of the heuristics indicate a likely attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/49de391bc85cdfe6a71c8811fc348ffc/savepafux.pdf In PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/fad5b50fa384f19b4553bb6991533def/18049549958.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8cf8d7f18---vikemurumamugujenewu.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/pirijuriforalumiwadefis.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/89546706085.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/70042192216.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/mipixigekudepasakatizepod.pdfIn PDF document text
    • https://ready4use.ru/uploads/files/rujezofurodar.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c01e5f7504e---lirafisafokowipeviz.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c441ad0170---zarujisin.pdfIn PDF document text
    • http://bdn10.cz/files/file/88781731847.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/60312303677.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1610d4938142da---mepifixiwubifasimez.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/bujofiv.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160be37124c8e6---16254313731.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29bdd99278---1771787903.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/49889066512.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/tuwasivazij.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/f8407b998938b5719f725e294efbb3db/zazubefemedaxud.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/54c2ae2104485cc0efe48e1311e50462/95656776954.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/64142390319.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/7f08227c5c9340e8e8af35db115a65f8/76528121559.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bde8621f5---16592262626.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=cost+accounting+is+related+toPDF 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_off0000d7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E5 10676 bytes
SHA-256: d063fcf86538489091e75f17dc31e78997e0a7d7d353ce8e5f7fbf088ac8f0a9
font_01_sfnt_off0000f055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF055 16612 bytes
SHA-256: dd977f7bf9cdf53a6bd422b3ef96cfc0d99e018c8acb7ee8350ff626d65dbbda
font_02_sfnt_off00011b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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