Malicious PDF — malware analysis report

Static analysis result for SHA-256 1869b912ea717960…

MALICIOUS

PDF

87.4 KB Created: 2021-06-28 05:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bb024224905270150282089147f2c1c1 SHA-1: cf416a5eb5ec2467fc2eef470c8a6f3e2ab5c508 SHA-256: 1869b912ea7179603c01ba73b12bd8b4fc8dc60f03a8012e2dc4afa1f2e8015c
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document was detected as malicious by ML classifiers and ClamAV. It contains a fake CAPTCHA lure, designed to trick users into clicking on malicious links hosted on compromised websites. The document also functions as a link farm, pointing to numerous URLs, many of which are hosted on disposable domains or compromised CMS uploads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/90f35a8f26bf2364819f724a87318dad/mawivabeveregawaji.pdf In PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/78024c7de674a6e14e6d6cc911c83b97/wufuzonig.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202106/file/1622538188.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/62731596193.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f603e81da---pebodanobivegufi.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/kuwisuvum.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27004c5408---lakasutedokuwakizum.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607427fde4de2---68918544097.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/31d8ce5811a2af7f0edc1e99b5975663/50731067465.pdfIn PDF document text
    • https://oversaslogistica.it/file/98062635549.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/5ae2ab34fc2cdbe3a455e044cc43648f/6200677890.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b75271f617---84909919345.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a048830ef---wukujorodebotikovefijatus.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/432ac22bd71a9ff012ace702eefe102c/wirabijirugulinovive.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/1122162e91860597a60194bdaba33aaa/21113110147.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/q0t59p76dggvqsnuf574jtj4i8/mevag.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2f07c42b6---wameluwabasuwelagewavotim.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/xofajirowasifijadu.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/1721b0e13f5ad28198351c9db5d41230/rusapasodewasuwesawuxixo.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/lh52tmf0re8a6u23q52267vm7r/rikinufepujimosir.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160736dd1d1ef1---7446950173.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/bca782a2eb76f07ddff67bd979a0906c/90198867428.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+recover+deleted+messages+in+instagram+directPDF 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_off0000f221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF221 17176 bytes
SHA-256: 37f9fcfb3ef2280598af28d76d63d320d6cfa6f194bb71759b48d503256e4a8b
font_01_sfnt_off00011edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F3 10856 bytes
SHA-256: 9f5e22c22051597aec945813cef7e35181662b4bf9ad21e5c5129e804337bc19

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