Malicious PDF — malware analysis report

Static analysis result for SHA-256 5824e50dcb2799ed…

MALICIOUS

PDF

87.2 KB Created: 2021-08-07 04:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 540facc46d99f1f0ddb781cb4f411adf SHA-1: 9a91c6a8a4befe4dcc96caa860c37acdfd77d608 SHA-256: 5824e50dcb2799edc37e53a9a25902071dbbfb35ad2144610ff1c75d0d3ed063
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content or downloads. The presence of a 'download button' heuristic further supports this phishing-like lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://studiofelician.com/userfiles/files/24203247516.pdf In PDF document text
    • https://ideylia.fr/uploads/file/84182580428.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d865bcb323---4325003130.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/6ebf9083edfc9fcbb41634cb276f29c1/kulekitojidirugimubijip.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ff4fcb66d70---bokutiwamanuwofebavizo.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/duzolixiwivuzikugusufanap.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d69ad42afbd---22877914643.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160993bf5a9ccf---75227536165.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c044e643f---dosagoxi.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d66409530cb---robofowepap.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f3860ad6d---38272681602.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/lekiwilojitijuj.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/87741612259.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928b1b409cf---wasuxi.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/93725657861.pdfIn PDF document text
    • http://rsst77.ru/upload/files/87753996074.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/2961945548.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/91605533324.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/77820843716.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/rigunosivuzuximebufogakid.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/49416571356.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608986df7f9a4---jewufufima.pdfIn PDF document text
    • http://podushka.by/files/files/90471241700.pdfIn PDF document text
    • http://www.proyecpapel.es/ckfinder/userfiles/files/48675446852.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=grand+theft+auto+vice+city+stories+pc+game+downloadPDF 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_off0000eec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC4 17160 bytes
SHA-256: 9261b769537d1f7251e1dd80ca4a096fbff9cf3369b84a8560ccd26919cb4c85
font_01_sfnt_off00011bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133EF 11472 bytes
SHA-256: 1a1949d1c954edebfc9cc654f68054b443103714d8f56092745981c21d4bab85