Malicious PDF — malware analysis report

Static analysis result for SHA-256 8774b76664ea28c3…

MALICIOUS

PDF

80.5 KB Created: 2021-09-06 01:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 75fb0e62d0b005149fdfa6ffadbb24d2 SHA-1: 3872ca467f042f3b9f79274064398a5b15c1625c SHA-256: 8774b76664ea28c3d7a4b4fceeea4661489a9d4e4dd734710fae8828b8f4b0c8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or link farms, suggesting it's used for phishing or distributing further malware. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=lesen+kereta+auto+dan+manual PDF link annotation
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607146d81f5f0---nuwiwasabepegiduji.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/80615454556.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/638515287.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/16088766539.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/50721841364.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/55534124227.pdfIn PDF document text
    • http://hydrem.ru/images/file/lowenibi.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/mopitusufotera.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a66da71bf31---mifinizezumadesogaw.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/81d1391cbdffc5536d7b857d4e311210/torojuzerunizomuroneti.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/1n7lh69omug742hpk11jsh0qga/30702422512.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/gurovo.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/6f8fpq5c1r06r9vchjc5q1rld3/valofisukoso.pdfIn PDF document text
    • http://minipit.com/data/files/buduwezanozudoki.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1608a73279ca69---lamukexidepasipomerowez.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/303cccc4c9657fc88df564ac5b912c2d/xapireguna.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/neravixetemufixopuzet.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/tumegebizabejulufojekude.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/rovifuvakixusirapejupuj.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/22603029007.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/79874094890.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/vunenadeberamerogakebek.pdfIn PDF document text
    • 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_off0000d7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C5 17120 bytes
SHA-256: 258ed04cf2213c3a451fe94aed1ac26e690549e4270e2eaabdf71b4ccf4b0009
font_01_sfnt_off00010481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10481 10464 bytes
SHA-256: a783e5f24745ea535c8b0aa30b9a9424d6d751083c8129ff1200375f5983d0f2
font_02_sfnt_off00011c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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