Malicious PDF — malware analysis report

Static analysis result for SHA-256 34cd174fb6aa74ac…

MALICIOUS

PDF

86.9 KB Created: 2021-09-16 00:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 45acad2e0d4560681ed0cec22ec158be SHA-1: ddc63db4837d05372374adf369adfcefbc051c3c SHA-256: 34cd174fb6aa74ac7e6ad41494416e4ab862c30a062261c43f2f3e93b1a3aca2
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous external links, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall detection strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://coretry.ru/uplcv?utm_term=el+increible+hulk+pelicula+completa+en+espa%C3%B1ol+latino+gratis PDF link annotation
    • http://cokhihoaiduc.com/uploads/files/wumepizel.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/33156484576.pdfIn PDF document text
    • https://banghenails.com/upload/file/50365482651.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef6006e8bf---55076563019.pdfIn PDF document text
    • http://fjsxsx558.com/upload/files/22145163166.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/nurimalarinizibafotedi.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/93535445141.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/lodapozawebokosiwopeta.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/444286557.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/60168367033.pdfIn PDF document text
    • http://aa-nusd.jp/negasafiremixer.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/2uop5pit4uhlmb0cvbhhlsp9q5/79102805490.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/gebuzugorerosit.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/buzevugisobexiloziwofabo.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/68942614231.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/66398414412.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/3606973336.pdfIn PDF document text
    • http://pietrek.com/MARCUS/files/file/37801458813.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/navoxelavoxowugevojemef.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/161403104a7422---43324279040.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/rugonizogarubodiwudek.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16132ee27f244d---walerafataluragi.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1613cedcbede79---xamosudujedeberipeloz.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/tuwigadafogonod.pdfIn PDF document text
    • 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_off0000e250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE250 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA67 11340 bytes
SHA-256: eb82e3ea5e6814204025549732487a20e8ab1986167fce9d4e377bcaf23bc71a
font_02_sfnt_off00011468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11468 21032 bytes
SHA-256: b161f7a97aa1901bbca97fcb591d0c5d10265c1e1acc910d17c996d02a07e449

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