Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1541c5ac1035e23…

MALICIOUS

PDF

70.8 KB Created: 2021-09-07 12:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a22c630a92aa772f0f77e0dcb4cfa748 SHA-1: 8ebcb78fa91b3f79a9efa1e65df765db23e422af SHA-256: d1541c5ac1035e236aff2a9bea40c9ab18960f2a2807bb369463cd17f2dff826
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6198c91f16---larefiwikaki.pdf In PDF document text
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/69573627505.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/97040593028.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7154ed3a04---84960142290.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/96322140674.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/zadonewepibozupasikewego.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/falasabuga.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/69450399650.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce2c495a6e---16176900293.pdfIn PDF document text
    • http://podushka.by/files/files/zidomiwu.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b67585e6ca1---sejutasugemogunetijige.pdfIn PDF document text
    • https://le27.fr/docs/file/21575631074.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/4fcb5c6f617f148828d9e51514691b9c/jadufego.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608589964fc71---gubifaderenir.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/rutup.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086859feae61---43673680949.pdfIn PDF document text
    • http://atiksigorta.com/files/34831789750.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/65509354138.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713f87ace59---30887872074.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/6fde9971c5a4b51e65ce1c1a07654271/54420051697.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/55776611598.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/sd7g8vjiflris3aukb44a37i2r/93615149929.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/vabexisomekaku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=fortress+total+security+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_off0000b73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB73F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF51 15520 bytes
SHA-256: 78e668d5aba0e6ec4f4b181ae06f582a3d301b0cbf7ea2f73e0b89670f98140a
font_02_sfnt_off0000f611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF611 10584 bytes
SHA-256: 15e409129570ff41e14aebb692638c12464a55d254fc5a024bc86c7b3686cddd

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