Malicious PDF — malware analysis report

Static analysis result for SHA-256 24d4df3d2f70081b…

MALICIOUS

PDF

85.8 KB Created: 2021-08-16 13:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: e5c4141c7e8cbb20483837f139909a94 SHA-1: 58e6fce3804a3b4dfb9a87cad9c74813fa19a729 SHA-256: 24d4df3d2f70081ba0233e03d10ec3be93e152efdd760a192232104d20093831
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://dianacb.cz/userfiles/file/77381775059.pdf In PDF document text
    • http://yaeram.com/userData/board/file/53734776380.pdfIn PDF document text
    • http://xtra360.net/campannas/file/namojutuvan.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/wozixufuperevufapilowagu.pdfIn PDF document text
    • https://rcot.org/userfiles/file/95917903454.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3aeaf9081f---jezadutenoxu.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075b9406ef1f---kupivej.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/xafowetisotuzabaxi.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/54824895860.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/12979705459.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/59ijuurbcr066rskgj3oe2jb4bhbsrri/66950293815.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/59a7048e3bad17972554b2dfe5d01f99/nejikoxuralupe.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d92623048b---zofafetapewut.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/m4e1rrvuf7bs5unm7dduhgv673/jititawujanimuvejeriji.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/d5e6ccd1b4368e58393c67db3ae921b4/60918936942.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/letafoxokadinubov.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c3754670b66---30523693266.pdfIn PDF document text
    • http://93564497.com/userfiles/kowixupapidasik.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/kenogeza.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/rovenikiralamewafuka.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/jo55v1upemj7tohqmf4e4phsft/88213673313.pdfIn PDF document text
    • http://amandamaitland.com/images/file/gagonozanasup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=research+design+creswell+4th+edition+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_off0000e77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77B 11108 bytes
SHA-256: 3be3a834b6d7c4d799feff89495875d921b9aa3d294f4c6453f21dcecb590e93
font_01_sfnt_off0001013c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013C 18124 bytes
SHA-256: 5a15c1464b0d0217c35d47c62905b75308ed31c9816d4ea90d37d83c15b348e5
font_02_sfnt_off00013002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13002 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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