Malicious PDF — malware analysis report

Static analysis result for SHA-256 a409daedd13a70ed…

MALICIOUS

PDF

77.7 KB Created: 2021-09-01 09:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c223799122280d2a8b93c5da409ff912 SHA-1: 08ab58603917de4d1d4fb8a90b1d3fd5e4032ce2 SHA-256: a409daedd13a70ed993da096fd15ed379c9e44d157636435409b736a49631d7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL findings are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://krisoc.ru/uplcv?utm_term=wish+discount+codes+for+existing+customers PDF link annotation
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987c5371e60---96385153828.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c0d956c86bd---naxuvelo.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/3da2e4b6901ad039fc368da561c15b07/44886883205.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e437de1560e---95512915220.pdfIn PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/46382559463.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/34995614313.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/89024088478.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/9722710149.pdfIn PDF document text
    • https://tipresentoio.it/images/file/fupigazig.pdfIn PDF document text
    • https://immobilgold.com/file/64528668207.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611d17063e4b9---91108999686.pdfIn PDF document text
    • http://apcmagon.com/userfiles/demewabonaziji.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/4889cc79e99bf21dcd26732248e0a646/94258259913.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c236f4a9f49---wenutine.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/levapuzudebiragu.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612b8a114dd5e---xewelov.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/6fbd7b55104f03b18d5cf5798229f276/roniwovinifupenojosoradup.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/67474875116.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/90158054485.pdfIn PDF document text
    • http://maidichike.com/upload/files/43078049176.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086f3cdf1ec3---mabajadibonapafa.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f978645fd10---safuvosobiboluvibugemu.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160741e154557f---bakewadetow.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/21295958773.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_off0000c8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EA 10912 bytes
SHA-256: d176aea68dc780fafe4e8b69c2fa3652e3ba95246cf14c13e5da7ad9315fcc62
font_01_sfnt_off0000e1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D2 18064 bytes
SHA-256: 3d7ebd0f4c78037edc97909bf33acf3a71979ae12ce03012b1f2f731c370013e
font_02_sfnt_off000110c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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