Malicious PDF — malware analysis report

Static analysis result for SHA-256 936ad69790614587…

MALICIOUS

PDF

69.3 KB Created: 2021-09-06 01:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 29823318df5d5d8c81e9c5ed480f049b SHA-1: 067a9fb8b0082295d206feb6ccc59f50f4104e94 SHA-256: 936ad697906145876603a0fbb094b2f60b8ae318af6a139876953c475897a122
132 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, identified by the PDF_JAVASCRIPT heuristic, which is a common technique for executing malicious code within PDFs. The PDF also contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution campaign. The ClamAV detection further confirms its malicious nature, classifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4270

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://tuzvedo.hu/elemek/file/91692305613.pdf In PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/f3bedfd5d91d2339eeca4baab77d41ba/21914588158.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/vugized.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/ad23be2851eeadb148a5ecd295923957/4577468255.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/55103943659.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/68b6d0eec840786f3bf0d8957339a4d5/kedazajax.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607daa335e3b6---38208100556.pdfIn PDF document text
    • http://anpharma.net/upload/files/puxuno.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/javusunirevevumaludap.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608db87685f62---53000575830.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/bopivuvixuxad.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16093d0d613c81---lubudolemimatipipijod.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/koritokonaz.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/97458877075.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/47369995160.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/vazezigiv.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/sapipulidajigeb.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/rizuxunewu.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/6c5f5f80b3b6063e3b9f05359bc6cc22/48391380784.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607674ac30657---32781395699.pdfIn PDF document text
    • http://www.moyekolodin.com/files/tuferatovanogunidawirala.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93904994054.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/lusimupabadapuwusanugitok.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/95f42ddec487900a83db8b7b4a25fe3b/rasikodakegad.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wenimoxumavanapiwotenat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=oled+tv+technology+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75B 10584 bytes
SHA-256: 618ab589f7d7a3beff2d03cfc0a601872b7f7b0bbc1d0ac24625dd2e60d7dd29