Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb6310b44c4ee86f…

MALICIOUS

PDF

83.7 KB Created: 2021-08-24 13:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 88a6cb933c9b8124d24272bcd3ea93bb SHA-1: 5126263804294277469bc51a4e082679c78bd498 SHA-256: cb6310b44c4ee86fd27d3c69db9bc1c93bc0b50beeaddd206caba23a9eade670
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded content, though heavily obfuscated, are consistent with attempts to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://allytemp.ru/uplcv?utm_term=difference+despite+and+in+spite+of PDF link annotation
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/d52e67deedc449748dc24a053f4ccba6/90683207836.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/rikikitegivum.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/junukemapoliv.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/0e24bd65443dee24a5c7e7491b2b7baa/tufirekupejagi.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a41b034288---tijipowadogifopalaw.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/2388901364.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021071412574173499.pdfIn PDF document text
    • https://sambelteri.com/contents//files/mined.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/61150184434.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210802104300_w6plgt.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/44294939433.pdfIn PDF document text
    • https://areicon.com/images/file/10671955866.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/30585353773.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/1011548c7a531a97ebf2e7f030b168f9/10095961061.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/gemebelotovulijusu.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/zirazaxerilifuxe.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/d00iipt5fdika3q188s83va4a1/7399266973.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/kuzakudimuge.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608246e499338---51381540020.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/xigul.pdfIn PDF document text
    • https://seerupit.dk/assens/file/janirefubebimaremiwi.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021042909543442.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f0ebea7cd---pivawejuwot.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/donam.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/bebiz.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_off0000e223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE223 17272 bytes
SHA-256: 777537c5f218ea05cd3d83e52c00ce60525450704158f39d5820c702b20919aa
font_01_sfnt_off00010e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E93 10568 bytes
SHA-256: 06381c7198c07db2f0d274d3aec45672bf486ab6fcb92fbfa039cab86293839f
font_02_sfnt_off000126d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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