Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e5d1842103f5543…

MALICIOUS

PDF

91.8 KB Created: 2021-07-25 21:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c46484da7018069d6dc43d4e79bd5a0c SHA-1: 28a968ff21495a8144ff48d61b787cee491a2fa9 SHA-256: 0e5d1842103f5543aa53598e0c02352bf70b4ca9441d33667d7c7880afd6d92f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URIs and link farms points towards an attempt to lure users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729d07ef375---75689300700.pdf In PDF document text
    • http://wagnerfamilyreunion.com/clients/866685/File/gatuwegixi.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/d8836d58833314a5679e9f383c7956b5/66941852045.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/wuritibikomijo.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608b12ceb1b05---vegusobivezuloxorelo.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/gugafiliteso.pdfIn PDF document text
    • http://centrons.com/uploaded/file/162244413060c2b7d233a74.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/fk3dlcjsn4d9itrei3s2llk4lm/wojusines.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/39141631460.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd18a7262e---vivir.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/74953773905.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/dddd9b818acc64295206dd6d0ba6ebe1/sunidevovetejerape.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6dbc79a6f9---87794198214.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/7526145143.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/55976723263.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/dawuxuw.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080211cd897e---bigure.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/naneniwosopupizu.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/jikepifomi.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/pqlgg350ptdbije2jejh0a4lkq/35697851274.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/34b9c5adfac74fcd917ee86a8a38349f/tawol.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/29457587774.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a72ce23c29b---legunedavilo.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/6392566478.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=what+is+chicago+title+land+trustPDF 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_off00010382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10382 16588 bytes
SHA-256: a1b05a87cea9912f94cc9c6a5c5fb6d7051d76f259e1952d5731ff0df1754d19
font_01_sfnt_off00012ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED4 10740 bytes
SHA-256: 1d851a126484bb4f02b342f7128c5ed29a72e00ac1cfdd2799d3cfd52bb7a430
font_02_sfnt_off00014750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14750 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1