Malicious PDF — malware analysis report

Static analysis result for SHA-256 729cbb96d4d6c07d…

MALICIOUS

PDF

84.8 KB Created: 2021-07-30 08:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ea0fcc1146ab2c89a5f9c326f8ab15af SHA-1: 631ee35e3c5ab2ca39777a100220387b1238906b SHA-256: 729cbb96d4d6c07d51175b166f4d68aa60ef86eda22bd91fae4c3a0c099fe2f8
164 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, some of which are hosted on compromised WordPress sites, suggesting an attempt to distribute malware. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://vmwarts.com/ecovic/file/bomibapekolev.pdf In PDF document text
    • http://rauvuonsach.com/images/uploads/files/muvupevarelatujusukinu.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/6979761531.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/5c023d86ebd7ef4f401137c3bfd752a2/foligoriwobuvufepiz.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/66838257442.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/varalowaxu.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/7f5396927766a94db34b1ccd45ea3749/63703857095.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/jedafezovepagujaxalo.pdfIn PDF document text
    • http://jngf.cn/files/file/vagusibumawekojibir.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/rozilazad.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/76085280007.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/xafagaweb.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/gubefopanufegi.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/5e3d98a21db4bb01d93d8dae40247cbf/xavakamixi.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/16435119686.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/68771333186.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/44144225045.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/rugulogimoxugapofobowa.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/xasujimavibovudol.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/k0vf89bq17vk7m2oijvl52mcu2/medekekamok.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/fulitorajeviramemip.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/fd2421df2472r2okmavpgsp69t/48331046347.pdfIn PDF document text
    • http://domplus.su/userfiles/files/87633834881.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609daa23a80ea---58823633385.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=yo+whatsapp+app+uptodownPDF 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_off0000eb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1A 16940 bytes
SHA-256: 88c6f18af7b45ff5586da8ea9d52a95bf982767f2b469d84bba0e8814b78b9d1
font_01_sfnt_off0001161c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E33 10288 bytes
SHA-256: 81728415406297d74264fdb0ad7ca143ba9d3dc37d808d64914512b94c6e8c61