Malicious PDF — malware analysis report

Static analysis result for SHA-256 dedc7220a82b169d…

MALICIOUS

PDF

72.5 KB Created: 2021-09-24 18:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 20c31c5581fa8a1e9bc2be2116345990 SHA-1: b24a132a6846b8d26198f5f87038eb205165ce90 SHA-256: dedc7220a82b169de2372da70f41b135334f433e9d6434a8cb317f5b5ec3931e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggests the document is designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a non-clustered link farm on disposable hosting, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=pull+up+my+play+store PDF link annotation
    • http://gintaras.cz/userfiles/file/safasu.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614906ada661b---wijemagapoxomelupu.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/segawebuxexoz.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/vobir.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16138e49ebd536---guvuwatiroxomagituma.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/19r3r2b1ohea03l1dlijp0t6i2/zixodorij.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/64601677600.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/28410731338.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/nigezujebize.pdfIn PDF document text
    • https://rossbeede.com/userfiles/file/xuligetira.pdfIn PDF document text
    • http://elpijisystem.com/file/dogomogipa.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/7508084000.pdfIn PDF document text
    • http://aurora-c.jp/files/files/90043710381.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/50686780155.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/86301549249.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/f4dfb0f223ff67610b35087112b11063/vagusomexedunozusat.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/kipitiwo.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/mimerowisorasoziwogegi.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/32827215446.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/49f0775d9d759b8d16a0e5fc3701a74b/83069840032.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/gisudatibobulikifosine.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/vafunepogorujoresenefokew.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/nopfvvb5c2du9h428gfriomtc0/91696501828.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/79081840656.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_off0000b4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4ED 10432 bytes
SHA-256: 4043e48eb648c6288958e4010286b03bcc2d6edfe417c7445028f34ed23d2f1e
font_01_sfnt_off0000ccb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB7 17996 bytes
SHA-256: c6bf3bad319575078cb8c3bdfc05e4168ca95d7dc2c7ae0de91c06013bb9faea
font_02_sfnt_off0000fb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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