Malicious PDF — malware analysis report

Static analysis result for SHA-256 72884f7f2f192291…

MALICIOUS

PDF

86.3 KB Created: 2021-09-12 05:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ae2d36499f1fd1c1e6e9cc6b52a84198 SHA-1: e2111b794e98f65027da00f7a4aa1ea8e40497f3 SHA-256: 72884f7f2f192291bb5d891d9be57532a4404ce09e316ac13d22e30cc9f57096
196 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a link farm. It contains numerous external URIs, including links to compromised WordPress upload storage, suggesting an attempt to redirect users to malicious content or phishing sites. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document may also be part of a multi-stage attack involving password-protected archives.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://masterjobintl.com/ckfinder/userfiles/files/56933824439.pdf In PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/47629437259.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/danaweruvojazuzep.pdfIn PDF document text
    • http://minerva-collection.net/files/files/18203101610.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/13183242105.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613483b99a916---39211016987.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/27960011611.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///papirupujesixebewewo.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/98039647788.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/bc7ee154e5a3a7b2f0727a7e24a21705/34532611520.pdfIn PDF document text
    • http://arhive.np-sp.ru/img/file/jidexutakorarijave.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/buwokiduvakinizomuke.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/zurowosonaxemo.pdfIn PDF document text
    • http://sieuthibds.net/images/files/sorexulo.pdfIn PDF document text
    • http://mcutech.net/files/30970272852.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/69208004928.pdfIn PDF document text
    • https://goodline.by/userfiles/file/15900840119.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/51808432685.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/59860543172.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/70966131533.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/53467869026.pdfIn PDF document text
    • http://koddous.com/userfiles/file/patodivosegulib.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613238aa27480---gusekifiv.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/panatuwazubopen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=applock+and+vaultPDF 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_off0000e251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE251 10256 bytes
SHA-256: 91f788c9500fc58a30de728de5cd090a0bbf013d4405ab1b26a853f7840b01b2
font_01_sfnt_off0000f98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98C 21828 bytes
SHA-256: 351f84a044221f3c223c7d26e862eb878894a4c63580000b9be4e496a5e4d9bf
font_02_sfnt_off00013375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13375 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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