Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c03d0ad7a98ed5…

MALICIOUS

PDF

81.4 KB Created: 2021-09-06 21:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d1c94886555505f4531f4f39a18fd173 SHA-1: 61446c279efdc9a5404c937c2d3e9ead8b7685c4 SHA-256: f8c03d0ad7a98ed5767cfcc411aab6dec4bef4f28e7c57b8b92db8f671db00a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/b09446c6dffdea3ec3ff09252328415c/1809501440.pdf In PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/a1db095b95812acedb11c551bf1cab9d/25937292036.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/vavani.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/kejanipafexi.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/gajifewokupob.pdfIn PDF document text
    • http://www.bash.cl/media/file/18512633542.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b59e8c60a37---mirunawebapexitor.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/sozitasabedemariduveg.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/6135205200.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/4563359768.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/21baee5378cb49f5228330ade78c1f90/tapid.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47b56ec433---12701671699.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/7b426b42c27f4221832ff1ae8b669382/63777745674.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/1290173328.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/zewetodasofoxonabopi.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/f53332206881485bc43d78e4bdfecf83/paseborerulazaxowigiwo.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160799cc879faa---mowunatewarefuwadopiz.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/lesijaxisopo.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9bfc21fd4---16077517638.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/bazovuxatusogizafuti.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16078a1f67f26c---banazojuvupoxurizikebosi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=the+everything+business+plan+book+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_off0000d925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD925 17484 bytes
SHA-256: fa62b17e8ca37024b43f8545c85ab401086f4843bb609667d4e6d7e43b8515c1
font_01_sfnt_off000105f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0E 11252 bytes
SHA-256: 74d700469738e8f26268be7464c39ff5ea38d4174ff76df08d01195816a96c71