Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dac303b3d1981bf…

MALICIOUS

PDF

69.9 KB Created: 2021-09-13 12:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c58557357359e04c7a050ee89d46a446 SHA-1: cd2953039856efc19b72e915b31dde53b25cd173 SHA-256: 6dac303b3d1981bf359cf4bd79599657d6f368265a565a533c3524101b988254
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites for phishing or malware downloads. The presence of JavaScript indicates an intent to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. 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
  • 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://irlanc.ru/uplcv?utm_term=war+machines+apk+mod PDF link annotation
    • https://aljazeerahdrilling.com/userfiles/files/66162453085.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/45814896847.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f79fb4c7ca---80556064939.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/38770402796.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/puletenokevosefez.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/75904059617.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/96655828357.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/53645857331.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/kupalonutugegewedolopup.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/diwesez.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/4310432590.pdfIn PDF document text
    • http://retailcop.ca/files/vunawiseledefifedax.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/88914436224.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/zunix.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/geniwozeler.pdfIn PDF document text
    • https://maria-galland.ru/files/file/59030410678.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/20090466703.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/v0i269e8adb48e7lt4i595abom/xugutikogejibutuso.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/62881664166.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/xovolerepesifumenubadufux.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/f78928f162962def4eb092df228dedca/sonolob.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/6621599473.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/kezoxadikokenesodotutal.pdfIn PDF document text
    • 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_off0000b3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B3 10720 bytes
SHA-256: cca10c63a56cf930d96b6379bfe1a2d184a82b6eb7b698baca50c190f6f02b19
font_01_sfnt_off0000cc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1B 15208 bytes
SHA-256: 08daf3caf8861f21dc87ec893f63ddaef953c54e1118ac0fd520033f685955e7
font_02_sfnt_off0000f268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF268 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1