Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b5301ab0071baff…

MALICIOUS

PDF

202.5 KB Created: 2021-07-01 19:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6e35be923680a9ced1a7bd599256580d SHA-1: 3dfb39b66f321fd0f8025151cf96858f2d99ce82 SHA-256: 3b5301ab0071baffb0358ccd96614611eb86bf08388543d8da4b817faf59e0a5
174 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised CMS upload storage, and a specific heuristic identified an SEO redirector likely used for phishing. The document's purpose appears to be luring users to a potentially malicious site via a compromised WordPress upload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9659

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/e9bc1759745afccda3d81173e12c6c55/9944808855.pdf In PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/23b55e64236633b98133bd44f11ab633/bovipakebuxep.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/59240742693.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608f67386acea---kejevobot.pdfIn PDF document text
    • http://momsystem.ru/public/file/jusopexixewexajo.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1a481f6b4---28194251825.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/3fce921e0331f2dee2b24737f4ab7c22/wanad.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/rajaxoz.pdfIn PDF document text
    • https://aashianarealty.com/file/fexes.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/28e4fee98543eaaa848d30c6202522d2/87041302091.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0dd27aee1a18f9f9f5af5466933484b6/xupopewibevijusijanase.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89fafd60bf---mumidawuguzuxugilowozam.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/43088951722.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/44065317923.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/piponatex.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/masekixesinir.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/36998114365.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160c23704ab648---rugukurez.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/69338371328.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/8f4d67a8259ee813432a51601c5219da/masefudikaforofozupebugi.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16085a76fcc3c5---72089790735.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/93370367827.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076fe12cc759---20254868487.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=stand+by+me+oasis+tabPDF 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_off0002be28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BE28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002d63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D63A 17816 bytes
SHA-256: ecececc478bbbca30ea869c7fe1f49ada4af4591e32a36196233c910737b8254
font_02_sfnt_off0003044a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3044A 10592 bytes
SHA-256: e5ecb13485e6298961e8dcaa4144748a5b25f407b3892665c3cbf4b3b77db468