Malicious PDF — malware analysis report

Static analysis result for SHA-256 05acfff22accccff…

MALICIOUS

PDF

102.9 KB Created: 2021-06-28 19:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 22ef14c2edb22964adfaa7278eb88ba7 SHA-1: ab74e9a2532ac1ea477c8833c0ab30473a08a869 SHA-256: 05acfff22accccff7df6326862e688a6fc6c75e1d5601c05d840d7308d2a8321
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs are consistent with attempts to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://hzautomatisering.nl/userfiles/file/velatutubito.pdf In PDF document text
    • http://viewcs.com/partner/upload/dextfile/zufakupelusezajofe.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/32933017417.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/902412662fffaed1d486076555e6b809/risopewafarawir.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/34382232054.pdfIn PDF document text
    • https://asi-filter.pl/files/file/16848802165.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/perinejizosab.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c073036a18c---nukutitazabikiwononof.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/s71aasui9n3ugfhf20l4gjlu24/20761975041.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/wejekudoveji.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/57585653158.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af96f543419---96617906979.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaa06565d8---69260115472.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/16494520997.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/et5bo1rbe2cce8iku3qo6oallv/wuvomokuxofexivujej.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/f2cd9482e353a86c2654ff0d8d253969/waduluwobexopudumoni.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/xexaxojuzejowodazuw.pdfIn PDF document text
    • http://webbuilders.com/files/file/13889639599.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/274977395e9c2eb0187b3199bd1e01db/80088332325.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/31e91a78ffeac05a66b48991fad3b54a/23921879455.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/bc4bb73d21e21c89877c57a88efb0f26/dinuvagosujugawugezupoxe.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/3b2c371a9873be0573e6dbb1085dc428/32387268312.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/cfdcc000f52afc049d95f86754863c71/29880463588.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca44b954d6---lodukikidumomidujenerej.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/7e9c423ec15eb47f22051b746d586a03/75781972909.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=lease+agreement+in+spanish+pdfPDF 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_off00012e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6B 10736 bytes
SHA-256: e7a36a88d1427a7655daaeb306bb1b2ab400f9f11d721d3aeb768f92d5156e6a
font_01_sfnt_off0001469e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1469E 18060 bytes
SHA-256: e27d4b9ee25a5970c5260f4f77ccf58380802f3601dd7081a6c8d40d6ff2cc5f
font_02_sfnt_off0001762f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1762F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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