Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d5b1c596b61810e…

MALICIOUS

PDF

85.7 KB Created: 2021-09-06 01:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c3de647fdaaff0a0f146fe2f61617b03 SHA-1: ea1edfd1518bdf4496d9829245007e4138c8e282 SHA-256: 5d5b1c596b61810ec37a55bd1da0ae92f77255d7ef9e44fa78153fee4b238e06
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. The primary purpose appears to be directing users to malicious content hosted on these compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/musiserozol.pdf In PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/nimenebemuteliwititafi.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/27808854246.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/40830135720.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a192ceca8---2630334536.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/cbddc3ce2c1f01bbae57a4694e01ed07/bevevaladi.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af890b3cc39---zekevumi.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebee2c056f---piduvejiwudaxubujokugugeg.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/6857765766.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb15ff32a5---mosuvenetimo.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/95638750075.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/74e73739b57f9b4e7be7dc2e04fb58ba/nezuwabamofebogebogu.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/kabigokukegokevolukegu.pdfIn PDF document text
    • https://arerp.kr/data/file///kekajuvomudugok.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/69fcab43960e835e30a40809e90f5a97/nowobozibusifasapekakumi.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/35403604054.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/98334358112.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/86052049626.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/98960403917.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/e1a0293c2be47967bd3082573a5a3432/pivovap.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902f766878a---19998104336.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/7c6b0d7aeb322d7a1c97c279dae8ecd5/mutazif.pdfIn PDF document text
    • http://samtekelektrik.com/files/49461609381.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/68769319164.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/botatajiwowojuzarixojozep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=lc+tank+circuit+pdfPDF 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_off0000e5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FC 19516 bytes
SHA-256: 5d9841759330392a3bb3193720da5c78560d7d2e14f235442232a7f8bbeea6af
font_01_sfnt_off000119df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DF 10296 bytes
SHA-256: 26de65bbf1ed23ab14daffe2b92b3d20bb348b17a825e8a243d71a22911a3b0a
font_02_sfnt_off00013129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13129 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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