Malicious PDF — malware analysis report

Static analysis result for SHA-256 59d8c8eda9805416…

MALICIOUS

PDF

91.8 KB Created: 2021-09-06 15:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4178a52f7c13df45e0a366b58d6576a3 SHA-1: f0afb70316ca0d54e28961664ea74116c936d795 SHA-256: 59d8c8eda98054164c26b49e353237d1e7d5f250cb72f290d5a6588d4f85b627
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farms indicates an attempt to lead users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=hvac+control+system+design+diagrams+pdf PDF link annotation
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610aad66d5868---22860470815.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/45727531851.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210808_774AF7F2C48EBA00.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/buxoxapepowekeno.pdfIn PDF document text
    • https://airbays.com/userfiles/file/sidikiro.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d578b12047---52524732494.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/53135788985.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/fowizo.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b06433f132e---ledumiritisokagodagarer.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/131bbc946ee6fa0fcd24741c9d209044/rokufezigitofeji.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/bepepom.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160fc40672cd6a---padogulijebuzunox.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/uncbu0sec661fdh7sc1ts4ss2o/26292984543.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f8f642778---83736655975.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/99406570279.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/18754621356.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/nokevutumimofe.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/tetixaxabatevatej.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/960b6365ac9a305e9d1d5ac1dc01aeab/fagep.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/miwizamegobixekex.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/natofi.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/73483506528.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/lanemituzot.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_off00010406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10406 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1D 11136 bytes
SHA-256: 7ab37154e776f42acf884a572ba9c910665fbddcbfa1efb98b5458787352ff25
font_02_sfnt_off000135eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135EB 16832 bytes
SHA-256: 270b75a7666699a3eea74694cd7082e2ba96faead8408a1ff6bb62686f2e3c64

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