Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0e82be3101c35ba…

MALICIOUS

PDF

79.1 KB Created: 2021-07-21 12:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: a8dbc57e0d1cd81724c8613060164f7b SHA-1: 03e756ee75eff4e53ec99fb4a546908f65fbb2b5 SHA-256: c0e82be3101c35bad335c031748761c13f8750631b153b01e8f82f4cb718263c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the link farm suggests it's designed to redirect users to malicious content, potentially leveraging embedded JavaScript or other exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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://gs-hemeringen.de/ablage/userfiles/files/85980992110.pdf In PDF document text
    • http://creptiles.dk/userfiles/file/8546260629.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/26590071182.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa6190fb42---riwevuvatadijedorotiwuxop.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/55702373047.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/fojevixepafij.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/24434624765.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/37rutid2c9230jruc2l26d00eh/34308766378.pdfIn PDF document text
    • https://digireg.nu/upload/91519519960.pdfIn PDF document text
    • http://asustainable.com/global/file/88727424576.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/a6a934b9797fd2b5f58378a340b0e746/sumetob.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/luxelularinev.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/niragitipesamejan.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/506eb4868c3c5e220721015d1b3c457b/22112444750.pdfIn PDF document text
    • http://bjjiffy.com/upload/jedolixefofo.pdfIn PDF document text
    • http://biocoils.com/img/file/vadabiviniwixajizurez.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/98648721646.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/013qk7l479tjm9goniqon7f881/mumeduka.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210601182842115873575.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608345c263e86.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/76841265793.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/lummm23a8ssj697cgh2gre8t02/pusisoleforepoxibujut.pdfIn PDF document text
    • http://essuances.com/ckfinder/userfiles/files/nalego.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-12/20210512171901475031.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/81204317406.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160723a5f77c20---xamurapimafojawonoletemiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=static+storage+variable+valuePDF 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_off0000cfc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D7 10684 bytes
SHA-256: b85bd30af257e2ba7c2a3786d112349be48ae27f6f2dff886c10f18f2d9df2e5
font_02_sfnt_off00010079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10079 17140 bytes
SHA-256: b75808ed1c97e2958b90a6942b1caff1d4e32d76143b25371daaba8635dfd433