Malicious PDF — malware analysis report

Static analysis result for SHA-256 c728494f08e01a8b…

MALICIOUS

PDF

84.0 KB Created: 2021-09-02 15:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 79c7f398f252d93cabc05e225b25a4c2 SHA-1: ad5afabd8f87f2b71538f916a129655ce9ad5d24 SHA-256: c728494f08e01a8b181a62e084173ee4a79882b8bbfab577c4b60d9c6327ff53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm with numerous URLs, many pointing to compromised CMS upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/204d4c879cfc4626332e3453454e81f6/87953290865.pdf In PDF document text
    • http://jkbprivateiti.com/userfiles/file/kolula.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/50129834970.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210601_5E30ED8D19425847.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb769f362e---73399636673.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/925e4bea22a29afa555b4bd3b37cd7ca/pivutujubuzuwinituzasiti.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/60905837852.pdfIn PDF document text
    • http://tcihk.com/userfiles/bovolivoluxirazareradigev.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/58801987396.pdfIn PDF document text
    • https://talleresimad.com/images/subidas/files/38466139065.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2d831b55d---26129535128.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/61363801492.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/mixidugudufulefe.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/nozewenedimidudaro.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/k1rc049vuf3cs8f4ha6hnu8vh5/21993434272.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/72117443599.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f707a5ea9e---84216369250.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/mofuviz.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/kuvifasaruket.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/40582304227.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bddae42f61b---58528627422.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/51930418767.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/1a85c53a8283c0214bfd9b1908d95efa/jigof.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/75154608077.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a995658d66b---kabidusaxebikenalanamebok.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1621343811.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=george+orwell+politics+and+the+english+language+worksheetPDF 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_off0000dfce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCE 17740 bytes
SHA-256: cd9278777fb2cd3ceadacccfc632ab634a6621119b709175d49c9ae9d4067560
font_01_sfnt_off00010d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D84 11112 bytes
SHA-256: 632e85b88dd099d1b261635739e6a9e0c996da21b7d504e6beea42f8a1a89820
font_02_sfnt_off00012740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12740 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1