Malicious PDF — malware analysis report

Static analysis result for SHA-256 c803fac8110b015a…

MALICIOUS

PDF

75.8 KB Created: 2021-09-08 08:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3c0770a2e3975cfc344eada7546f57ce SHA-1: c642d9fcddfedf0a4c0932e1b19473a98fa2710a SHA-256: c803fac8110b015a6a71cc97ba9033f5f696777192e682e98f21ca9cfdcc7303
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that exhibits characteristics of a phishing lure, specifically related to invoices or payments. It contains numerous links pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the download and execution of a second-stage payload via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26aa5048ac---minere.pdf In PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44469938567.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/62d3c723ec36ade25c95264a1a14bc94/68107598487.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16111f581b57ef---99127123313.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/dedd9ffcc1234800a53e5d6204800fb9/39020305105.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/117d4f24aoda6k292vamlen37a/50220889052.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/d45b3cfb4f8593d9c5773c5269ba1d7d/87791339448.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/97762678834.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160731008be763---nedepipamezazifes.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f6fac7b44---29269028745.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/zudunewejis.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/bugosubefuvupotatulexa.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/gorowop.pdfIn PDF document text
    • https://ecosolar-energy.com/piceditor/file/30207561486.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/9e7c70357c71aba6942980e1b105e909/325036887.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/369ac535334cb57b033a21d53233499a/ziwumurexuduguje.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/nujavobopisewasuluju.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/79484403396.pdfIn PDF document text
    • https://agatanorek.com/files/file/24892807346.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609973ed74028---wetutuxekumuvasudojaxate.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/18564005593.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/49296851171.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=advantages+and+disadvantages+of+trade+liberalization+pdfPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/87798553745.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_off0000c4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CA 16800 bytes
SHA-256: ed721c199c09ce335b622e1515b34e655f7cd1a86015bf011cdad2d32200d576
font_01_sfnt_off0000effb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10812 10920 bytes
SHA-256: 7c0b38ad06ef5425f7ac50cf4004b0f9a5d56cebe48fd48dd698b263cc28ee34

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