Malicious PDF — malware analysis report

Static analysis result for SHA-256 adcaad6e6a6597ce…

MALICIOUS

PDF

149.7 KB Created: 2021-06-28 17:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9869d1cd74688bc54e24f56215d2efab SHA-1: a2a870929d0b79cde036fc3a5d574a0df7a05ee5 SHA-256: adcaad6e6a6597ce1a6412fc6b9444d6d8c64940c07d744187d407ac21cd6cd4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier. It contains numerous links to compromised CMS upload directories, suggesting it's part of a link farm designed to host malicious files. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs users to copy and paste commands, a common tactic to bypass security controls and execute further stages of an attack. The presence of these elements strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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 http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/b5ac54f2bcfa9f34c222c7c9b999a658/88521358076.pdf In PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/15c36aa4ec7ffcd137e68ba4d6a93fea/pejub.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/0c4bffe5daaf99f15c526609be9fc0ac/16405265934.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091d2a39f641---jomusu.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/sekametotawimigapowidije.pdfIn PDF document text
    • https://dhesient.com/media/kozarosoliwojexenofirasoj.pdfIn PDF document text
    • https://fallsplat.se/file/fojovosifam.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c79649bca40---midiwij.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/5045a2b8d33b2a48356ad7832987fec8/leremeveratawopekodebu.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/mezejofapi.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/nalal.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb55c9572b---gedibudukobalukalebunub.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e21f6a6ecb---20851578024.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708ded533b2---8043333547.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/25934300856.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16071e15b931a1---wokevaruxokuzelunav.pdfIn PDF document text
    • http://aimic.com/userfiles/file/72431706250.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d1d5f2913---faxatirawedarosisozoveb.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c1dafb201e9---lenelowutinetorojedekis.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/67nkpc574fjf5dak1r8b03i4m3/kosogipanoripukirarepa.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/ciq3r0fl2spaiu8i07bm0o3la7/zibijepegafidifurukezo.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-27/20210527053604972186.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=rslogix+5000+sequencer+tutorialPDF 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_off0001e3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E3DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001fbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FBEC 19376 bytes
SHA-256: e6b7966b2ac7cf4c9ac5ea192f2ac21fb7a0e179092b9fa10d29be7844b34808
font_02_sfnt_off00022f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22F6C 11052 bytes
SHA-256: f6ae267312496c636dcaa0e9d7f4eb128b9a606f6593b0cae34fc0eec2788145