Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f89ee7765e5ef4…

MALICIOUS

PDF

82.5 KB Created: 2021-10-07 03:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a043586eb33dd4335e9c98c733da5e66 SHA-1: dd408e1321323593ee98b4ab5d342144a65bc0cd SHA-256: d3f89ee7765e5ef44bc94fd21042315b7630fb1a15e4b39daa10c7d7fc01f2cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to manipulate search results or direct users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ferdavagnar.is/images/fck/file/53545988154.pdf In PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/mulodakakasebov.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/m1arqe0k23aikh4tagkod6pctu/31526866977.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/natoluduxugor.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/42182715498.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/pipovidezuzoxol.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/bakivikapebatijutinegos.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/76114512076.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/nudas.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/wemomamegifebidimujuk.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161350c310098e---82330988826.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/3f0017b06df6741e0ad6daec568bf309/forolikipomexu.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/womot.pdfIn PDF document text
    • http://hanifeugur.com/image/files/kadabamegebokos.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/susot.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/56740226771.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614fb795688e6---47524116077.pdfIn PDF document text
    • http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/20810364223.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2c59ca5ef---2407487419.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/kafanefolaje.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/rijolunamimasesoga.pdfIn PDF document text
    • http://millenium.moscowfashion.net/content/xuploadimages/file/velewiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=letter+of+intent+to+purchasePDF 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_off0000d784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD784 20288 bytes
SHA-256: 0af43b6fe7071d4aa5f8fd23fdf48bd98afe57cc2feda98577f6642149649709
font_01_sfnt_off00010c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C21 10588 bytes
SHA-256: 9749e03b5035982c3052e05e1fe426e06f2d425067bf9f282379e6744e765919
font_02_sfnt_off00012440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12440 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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