Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c7c438275446a23…

MALICIOUS

PDF

71.3 KB Created: 2021-09-01 22:31:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 41bf4676e23abef7fbf5e6ea18495753 SHA-1: 3c93198581d12e6ebaf738714771445b83df39b8 SHA-256: 8c7c438275446a2387ae51bcccb160cfa8b9d0ea9aebb55b98d95c26cf0ff23f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites utilizing the formcraft plugin for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript stream, though not fully analyzed, likely contributes to the malicious functionality by redirecting users to these potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073efaf701b7---81614706080.pdf In PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0e41b6a70---togodewavetuw.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/dorazemadomenelugopu.pdfIn PDF document text
    • http://gr-chem.com/upload/files/7361294950.pdfIn PDF document text
    • http://shihtzufurbabies.net/clients/d/d3/d383cf0c90cf2d2391705d5438694b4c/File/3977616203.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864913194a0---sanowusuxizifasurego.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbd8365a25---tovetoxedakawukirogija.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/66agtjalil7hi8c41cu5fnf3ca/ledediwepibuxugubat.pdfIn PDF document text
    • https://wecareprogram.org/images/file/20617089668.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/54056371987.pdfIn PDF document text
    • http://mesterek.net/tmp/63244741977.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/541b1734fa820801bd913762b35ba3ae/rires.pdfIn PDF document text
    • https://electroagro.es/pub/files/talejeposalokezugajar.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/8325082359.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/regafiwiberobuxum.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/98783509671.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/c022ed9b3463174640a4e1061a2cb6c6/24159069576.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/vumobifopew.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210602_6394AF5CEE142F98.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16109fd807380e---5716339183.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=int+float+double+in+javaPDF 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_off0000b518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB518 16792 bytes
SHA-256: ea2f898e6f79218610abd972ac6fc485d251a2fed13c2b7503b7e43828def233
font_01_sfnt_off0000e060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE060 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF877 10468 bytes
SHA-256: b414856032b66cf7cb0e8258966f7248561db125f0bf7c9b0df2c9d11cdb7122

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