Malicious PDF — malware analysis report

Static analysis result for SHA-256 111f70c53e0c8db0…

MALICIOUS

PDF

83.3 KB Created: 2021-06-26 23:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7a58c4d7dac4f450209ac45ee5f5e37b SHA-1: f893be859ad857df756e909e8e580ae96ec5f32c SHA-256: 111f70c53e0c8db0d4e4c43b26ba68ad2040e5cf3c38b52c315173003fbf218b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://wastran.ru/uplcv?utm_term=equations+of+lines+parallel+and+perpendicular+worksheet PDF link annotation
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608673bddc7cd---gufamozivesewip.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/8c0evsck2r42sgcjvr06bcb2r7/faladawenurejixo.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/nimege.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/7lreqeqirrc0ln0a0mjav1kpfr/dizav.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/b2fe23d0422f1754490f42d12c8700ff/91913173974.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/i5026915q9htpno3dr8baf3gd5/januna.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/7d0c632fa29b60087a4e8302bd6e73b1/mavevodabolumizogadobex.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/ij7qevcof9hue0hejudahpifb1/loporotupasejozojipezuru.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/vurisijiluzaxunefono.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/21635889529.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/75275126284.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210626035656.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/33344b3af8d0dc89dee7a90afa9d09e3/61281627325.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/85452278903.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/96820376694.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/fimudomam.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/4bfd47383ac82979bd49438d9364646d/17583435823.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/laligebedudeg.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076a89a68262---41770483387.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/fenamepuw.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/87231156571.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fbd68e33a---94499872710.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c591f2e33---11037806753.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210605051907.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_off0000e2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C9 11124 bytes
SHA-256: a93838aeac830ae235a4198e152b468cd709ec4ead300f6adf57a8b942f2e33b
font_01_sfnt_off0000fc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001149f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149F 16444 bytes
SHA-256: b5471b079d91d2dd9232d09df3be00f499af615158bc161bcab828bb087d22bc

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