Malicious PDF — malware analysis report

Static analysis result for SHA-256 177a35c33c8f8133…

MALICIOUS

PDF

95.6 KB Created: 2021-08-09 06:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6ba0b06a76514f3b81c3d9be6d2325c1 SHA-1: 30b2a10b519b87862a2db846d4685fe4b6130894 SHA-256: 177a35c33c8f81336e5aa1910fe79bdb8543fb9e28042c5d94b07876efe4acbf
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, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other unknown domains. These links are likely intended to host further malicious content or phishing pages, serving as a distribution mechanism for malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9ce5d7ec0---bidofe.pdf In PDF document text
    • http://kangs78.com/clients/66216/File/jelepiw.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210806224650.pdfIn PDF document text
    • http://mobiliteit.nu/files/37588373957.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/77348554619.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160727b0c2ba76---bexujorowomapirelemoden.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/latopiverekuw.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/lakuvojiwodikafi.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/lk9fnosr5ftpk885mjl9l4ut8i/55267680214.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/17pu9nlm5chhj63c0gu3kl4hl5/jinebutijokoloxe.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/671975694.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160addd07823db---dimofalusanoxatisuruwixu.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/sukotuw.pdfIn PDF document text
    • https://equinox-e.com/upload/files/wozowukulaterazekoba.pdfIn PDF document text
    • http://topas.lt/userfiles/file/wilagupirobuxagus.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/vezegig.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074632c03c29---xuzofadisatutuvomepara.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/zezowifodinugokuxobagima.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/43793638459.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/24f96c73qqpe6kerr9f5805ejv/14487228602.pdfIn PDF document text
    • https://baongochoa.com/upload/file/dikologopititoganewokufe.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0374c481b0---musunewajodujikewewad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+cuckoo%27s+calling+book+seriesPDF 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_off00010b9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000123af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AF 20544 bytes
SHA-256: 97f86a45e78b2c92398977c019fd7de7ed7273d981f234caa5ecbfc99e57660f
font_02_sfnt_off00015507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15507 10740 bytes
SHA-256: 252147726665abafcc319ced659413c9804b4fa7e71007e3cdb4024fd30e312b

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