Malicious PDF — malware analysis report

Static analysis result for SHA-256 c124b1cc69cd850f…

MALICIOUS

PDF

102.4 KB Created: 2021-07-26 03:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 66ef0694e184e62357429a978754da83 SHA-1: 478097ee4314f09b4e95a515752a7ac1aac16e5e SHA-256: c124b1cc69cd850faaf976b6734dc7c9207feffe04836f4b6436397c380ff0b1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malware. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic strongly suggests the document's intent is to trick the user into executing commands, likely to download and run a secondary payload. Several URLs were extracted, some pointing to compromised CMS uploads, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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
  • 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 https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/a486db47d58855db38a5c6c4338c9e74/medudu.pdf In PDF document text
    • http://peterpan1996.it/userfiles/files/27672223606.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e7366092e---21755613405.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/6f0nj04jhlq7d59tt96ljr23j3/61776986844.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/judezitunes.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/8bfd71c4db214db96afad2a721eca1a8/nutoxipupatekenetuv.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/78837999902.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/ef01697afda33ecd62f3f94b5795bffb/70758454843.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/af80825bbcb1e1e4dbe78c75dc1a5373/wubebip.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/litawunakeju.pdfIn PDF document text
    • http://sns.hu/_user/file/rewemala.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021052318492773499.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4f5531e1a---tuniviz.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/3rlnpem3nrfr08qkh9c1jlec06/kudurekoso.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/040547129804.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/9255858b25ec1a20b29e87c4274f742c/77075122522.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/11723952329.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/945dfbc94695648b4967f84189be07ca/72411977403.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082f1d396dda---68449898984.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/b3atgthm6mk7lemcbvhfa9h3g1/xozidaxovejafarajesabuw.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/kifosemus.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/9f82a127afa8938a50cf16e8f82bab69/badipi.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b987c5cd325---majumugajep.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099dbc930ae0---xeduxavazusixod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=truck+dispatcher+training+manualPDF 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_off00012db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB8 16668 bytes
SHA-256: 19ccaf994db09da28607132ccb0aa588e268c9f613391a6ae63b51e007a1ef8f
font_01_sfnt_off00015951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15951 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17168 10996 bytes
SHA-256: af3f3d58be1a2d85858ccab5d6c32c588fa8b14c32716c49965aadf78a9c2093

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