Malicious PDF — malware analysis report

Static analysis result for SHA-256 432dccf4c7d347f0…

MALICIOUS

PDF

80.3 KB Created: 2021-09-17 14:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 672dd27ae8ab7a030481b38754749132 SHA-1: 891cd00be5b0a1720dc126282453dd3e51e24b48 SHA-256: 432dccf4c7d347f08038c5154149887cf9f6cb56eb52aff0287632335a01cc01
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm and potentially malicious, with a high ML score and ClamAV detection. It contains numerous URLs, many pointing to compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct clues about its specific purpose beyond the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://epagneuls-bretons.fr/caningest/images/file/datevezuxogukato.pdf In PDF document text
    • https://kanalprofi.at/UserFiles/file/46721174670.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/nanabodixisiwoxaki.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kidujidajux.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/79846370412.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/ohcuctnne1845uo9kucaqr8q8r/pajebirekotexatiluzamas.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/dexulizugo.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/mimoto.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/kitozaguv.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/bomilamirex.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/39110828275.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/83075824617.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/fitikevavojelopuro.pdfIn PDF document text
    • http://orthopediedelft.eu/files/59092845636.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/259090bb2378dfb5d977328c8b4da6e7/86002118935.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/semimo.pdfIn PDF document text
    • http://dc-3ed4d7413bdb.prshots.de/uploads/userfiles/1630823701/files/getenokewujulotixivuw.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/pejokajebowowi.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/59588405226.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1ac300732---tosamijixiwaxaxepu.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/53202909054.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1db103679---4522655118.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614168d23f7c7---tazemoruvetaf.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/linebunigudobibag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+import+contacts+from+phone+to+phonePDF 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_off0000d779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD779 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF90 10776 bytes
SHA-256: ed693ed8844e902a33f70ec39c0ae907f53ca73d9aa3cb6d95cf4551bfc52a34
font_02_sfnt_off00010838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10838 16692 bytes
SHA-256: 43d17c826f5aacdab466334a9b2bb95ef8b738905577eef5f27766093cb7f5d0