Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd534386cdbbdfa…

MALICIOUS

PDF

116.6 KB Created: 2021-07-08 11:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c5b7c7ac2e581140b76a7790a57b7486 SHA-1: ad0fcd85c1269a0f54c53f04516d3cf45351f842 SHA-256: fcd534386cdbbdfacff802067fb53dd4793e8a67e403617910fc26dbb1ffed4f
164 Risk Score

Malware Insights

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

The file is a PDF containing a link farm hosted on multiple compromised websites, designed to trick users into downloading further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple links to potentially compromised CMS upload directories suggests an attempt to host and distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160adeffe30947---25696889287.pdf In PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/5f9gat6ef5n2ngpk1rdu3t9rbh/jiziwaxuwedefidipa.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/1817206011.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/8c81587c94eb213c9bf0b9b8810eedd4/13969475239.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/3249c57e3c6ce72c4b84515ee769b9d0/vapegavagetunozuvo.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/bac38c21364ffe686411b5fdba7f43ea/47114041012.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607628c272e00---duruxaloripajene.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/43173499014.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/74720433185.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/65930557524.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba96c1186f---kolonoruruguduburefarele.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4c9c50571---78655342590.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/og04k0g4s68lqgl5sck9ffgbpq/39453221609.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/volajabomejutefop.pdfIn PDF document text
    • http://starlightcelebre.com/clients/4/43/43e9139217482d7666ce300faf566241/File/jawofesujakakupajanozota.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-18/20210618065309204408.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/39375060115.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/15722227726.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/l4ob39ls3ga9ve9jq0k2honnub/62744815186.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d2357fc34fd---81452465981.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/38ab4ab62b513824b6e465196a567415/50695244231.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/30738943135.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=applied+mathematics+questions+and+answers+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_off0001606f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1606F 11196 bytes
SHA-256: 6aa7fc54686bb8ca8497ed43681a9d4491cae7faea947ca9f2a9768e8317a4f9
font_01_sfnt_off00017a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19260 18844 bytes
SHA-256: 6d0a8f248da6e3e1055d558ef8a45d0a2795daab7794ff097e7d0a166e497362

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