Malicious PDF — malware analysis report

Static analysis result for SHA-256 c395b591c3af3589…

MALICIOUS

PDF

90.1 KB Created: 2021-08-08 08:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ba7cfa0f71884e06cb36b7c3dedf46f5 SHA-1: 1a90ebfb71f7814405c0b3c633f0f0ab78ead3fa SHA-256: c395b591c3af3589bddb429476568599e67b8a9df69d354f6de65b8e028e62ad
196 Risk Score

Malware Insights

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

The sample is a PDF document that exhibits characteristics of a phishing lure, as indicated by the 'SE_CLIPBOARD_COMMAND_LURE' heuristic. The document likely instructs the user to copy and paste content into a command-line interface, which is a common technique for executing malicious payloads. The presence of numerous URLs pointing to compromised CMS uploads and disposable hosting further supports a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://learningkey.org/userfiles/78707382625.pdf In PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/6eae9fcd1c2f3377f206e1d0b3902e92/1401321379.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/7594e12fd7fb950a5c68fe21309ef7ad/92485413604.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/mokuzigisatiwaxu.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/71775440879.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f97dc7ed9---lelis.pdfIn PDF document text
    • http://gibisch.com/files/files/96270994827.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/gepinelugusetev.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b04de43c4---38535367967.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/6941284321.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/136f50943121075bddb2f24672078e99/kesojoxazasaramesiliki.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/zibekosoponubep.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a84c3e3d9a5---kemolozapezed.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wazuzefogiwufulixuserow.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/75835345826.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abce5d239da---zaxemo.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/4482f6835b0526e83711fd58c925b306/bexejapigetoviriga.pdfIn PDF document text
    • https://ambalatender.com/upload/files/zanig.pdfIn PDF document text
    • http://abpaluso.com/upload/file/teratepolutibisebebomemux.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/mufedaperadusonuge.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c4eaae9b7---litirito.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/kolawoke.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/dmepgsjcbhkuph93dfvmr5ufpo/rukiredidikabexekoka.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/f4ca8c566c3897f0ab45948812f788ff/21973514293.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/fff7d0457abc4b559b17868518023a43/58915069127.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+stop+double+sided+printing+ricohPDF 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_off0000fa7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7A 10948 bytes
SHA-256: 6fec168a11e53c4406d38d410d1b1ee2a8418740ccb9ce5ead9838dee8c90d9c
font_01_sfnt_off00011359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11359 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6B 17488 bytes
SHA-256: f8b8f59c7440f1f0c9391043873532f6810b38e681b8e7cdea8f65715b4628b8

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