Malicious PDF — malware analysis report

Static analysis result for SHA-256 3319882142d94a49…

MALICIOUS

PDF

81.3 KB Created: 2021-09-06 04:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4a02e6ed5b809e2ede34a771f516d451 SHA-1: b0f706a6d94055c42634466a843f1500167f5e5b SHA-256: 3319882142d94a4908ab1e576c3a298f96bfdb1883ff98b3f106a373b738ebf7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to execute malicious actions or redirect users. The presence of multiple URLs pointing to compromised WordPress upload directories and disposable hosting suggests a link farm designed to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://agentcctv.com/userfiles/file/bejilexidarokabofabubojej.pdf In PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3d162a6b6---74781952017.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092180e504a6---1854094203.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/rejobudusoro.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/57163848071.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/43439180363.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/53584523129.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gujovedaganizinilisal.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/26192044090.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/58607140519.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/puxezojuzazu.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/59642585382.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/jodipozijokubawuxetuwo.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/49997455850.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/17832582439.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160c60d37ca4da---9046519132.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f7ab633b1---54282906734.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/vaxikefaxig.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/23e921b0ef900e142e4029e818a0987a/75008564209.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/14f7b9952338cb5890bbb6aa4a8c5db5/vesizulolojidenufodixobi.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/692b94dcecd5bd579b6427fe9000e0d2/tadopos.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3756348cc---vorelagovusugib.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a715a80dbe---85761471934.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f62e1b22ad---88402306485.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=trenching+and+shoring+manual+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_off0000d817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD817 11032 bytes
SHA-256: c993580add3cf171ff237ed52e0907acbc294b83b802e3ad8e1ff0a4a429758c
font_01_sfnt_off0000f14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001095d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095D 17744 bytes
SHA-256: 96fac46518ad12625077c7801656c6d011c3705f7418efca21314db43a23aaca

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