Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ae727247d08d1c…

MALICIOUS

PDF

76.3 KB Created: 2021-07-03 13:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5c09ddbf7654f31cff4c6ed887c922c7 SHA-1: f8b167c406a194cc579afa956a974144d2a6a7d0 SHA-256: 37ae727247d08d1cd195b1e4846e4713e57db1092e45c270acb428e7c35cd428
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. The presence of numerous unknown URLs suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ae94cf505a2---90378958631.pdf In PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a7c1e5ab6---75222446627.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/fc6f5529e12b94290c4f09924ac5e731/11062594893.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/30208882092.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/5aee6ad170f86262e745cf638ca57b05/nakidopalaginobutetezow.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf23cbdce0---57149495210.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b991306d2a---28811598641.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/25dec4f57b638a542657bd9b75169381/94950060860.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ln4q86vivdq8mlqgvgancomn8k/sevilan.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/tedilefudoreviga.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d74bf31cf9c681cf8e44434fadf2bf93/30575551894.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b0fa77341---77681383607.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/52717474102.pdfIn PDF document text
    • https://hirurgija.me//files/xufowokiniwet.pdfIn PDF document text
    • http://skyline1968.com/clients/74864/File/wuritodimezeloribep.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f40ba5f667---gejoriviganumeja.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/98777451295.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/54705e1f179e91066dcd9939f8c37108/zominoresoluta.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7c708f823---53395447629.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/15709362041.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/2988a1833f7957f408232db2766673ea/nuvozukirix.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bd37536a6fe---teperuwexubopunuzebixemuz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3558b68916---pasab.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/newulamarizod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=mankind%27s+search+for+god+pdf+free+downloadPDF 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_off0000c5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D7 11008 bytes
SHA-256: da7cf4400b0a455bcbb8386908e36072c37b81062280187074e14d189664fe01
font_01_sfnt_off0000df30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF30 16900 bytes
SHA-256: dc1c83a5322763753978c1aa98d77cc1dc6fa0bd9a26d158a65442d79659d9c4
font_02_sfnt_off00010b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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