Malicious PDF — malware analysis report

Static analysis result for SHA-256 d463df0d81821b3d…

MALICIOUS

PDF

70.9 KB Created: 2021-09-07 17:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: edbcd137c82132f6fe2fdc2c544b9318 SHA-1: 9a5fb151a707f36dec623808bce5a7310b634a7f SHA-256: d463df0d81821b3d36b35a9f337cf6db43a54d620af49263fd0c3f27a85a3873
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 compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://mistral-paints.cz/userfiles/files/jowurilesuzenimiridetum.pdf In PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/bb53171c425322c89d57ea5a765d6190/95387803197.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/lufadunuruxuwowi.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/65094929096.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/00f6bf8e731ae2096fabb388bc8111d0/92312178844.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/vasevazunobotozotekinezu.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160866aaab3c66---zebepipepoxunal.pdfIn PDF document text
    • http://dges.in/userfiles/file/98864069809.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/733f8a1efc34e4cfb7171d6544eba074/48749849888.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/23506779113.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/18040429288.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/57343024822.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/bisugimu.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161002500397b0---2013896815.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8ffd9a3ad---sugowipiwodilasaruzoj.pdfIn PDF document text
    • http://whatdwellswithin.com/file/7118091062.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/83538114956.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/vefabaxalegamomegazorive.pdfIn PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/zikififilop.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/3k4qqhdvv10j0lk451m3ba14ns/55209842681.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/bobidiranekutapiwosazuri.pdfIn PDF document text
    • http://macap.nl/app/webroot/files/userfiles/files/legamipajofufalozexudi.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/zivitopujalatikak.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/zelivuzizonifu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=jeep+wrangler+2018+brochure+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_off0000b508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB508 15152 bytes
SHA-256: 0196077999de9ea924cd014cf865e3ad2340de6cda557c56f788215e7d6aa597
font_01_sfnt_off0000db62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF379 11360 bytes
SHA-256: 83f0f1f29feb9bacaa8c01d2366fc8999c7fcabb4296a3b27a43209c71518ed8

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