Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b909948637f7c3…

MALICIOUS

PDF

70.9 KB Created: 2021-09-28 08:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 28c1b60553137e13a647507528784be3 SHA-1: 2d042bd4ae5f30799fd0667189967bc518ccfc4b SHA-256: b6b909948637f7c39d282d2120d951e88b1cb4362d0268eb523919bd1a1a5c18
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded URLs, while some are marked benign, are part of a larger pattern of deceptive linking.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://bigdoughpizza.com/uploads/files/wenadipukejaroxakofato.pdf In PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/padisolajejoguvupubuv.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/58974551383.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/nadopezixeg.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa60718049---sanop.pdfIn PDF document text
    • https://tepihtrava.rs/files/23174429684.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/08fe3f8953749f053b328afb6aaaf5c3/beputuvobokixodupulurevaf.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/49048203742.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/9738479118.pdfIn PDF document text
    • http://wohingltd.com/userfiles/sosolimejef.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/legun.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/25341238905.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/bezoluburexota.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/50895843281.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/51e93ff327c33c15c40e3112346a03f3/bupotubisatazutibefewawoj.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/vagepu.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/dizota.pdfIn PDF document text
    • http://it-hair.com/userfiles/bixamufimapakonig.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-21/images/files/67271614887.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/35735067772.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bdef929ae7---8647019358.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/d35f3925580be3dc580c0534586ce0e9/24137271796.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/powoburekegigobokon.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/5be1c1c85bc934f8d0908529048f7702/sozakugawuwobire.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=mi+android+tv+remote+not+workingPDF 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_off0000b389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB389 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9B 16468 bytes
SHA-256: 90ab7ca8e26e5094b668610437ae86fa744f3108e7583dea883f0d33076dbce0
font_02_sfnt_off0000f5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CF 10616 bytes
SHA-256: 8bc4e83dc0597728c5e95c5d04ba890e73f4156368a8caa22120b616ee95d3b9

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