Malicious PDF — malware analysis report

Static analysis result for SHA-256 6723e69e52601a5f…

MALICIOUS

PDF

104.0 KB Created: 2021-06-29 22:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f6065c6010d5b38e6ca2287e7a584465 SHA-1: 965da6b990388f32d88f1ab3b59d0453c20e7e7c SHA-256: 6723e69e52601a5fa44631ad0b11360d7dcc4ebdf446ed09987cc4634328b7f1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell 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 body is heavily obfuscated, but the presence of multiple links to compromised CMS upload storage and disposable hosting suggests an attempt to host malicious content. The ML classifier and ClamAV detection further support its malicious nature, likely involving the execution of commands via copy-paste actions to download further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6465dcba2---mazuwef.pdf In PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/8j0au0qutkngil4mu62p01f933/10789971527.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/793ad022709f493558c4a8b59f677c5b/36523427652.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d04accbc2---16927037804.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/jujidofufevokarolisamebo.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/68636249582.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160856c92b0265---69626295805.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/1609a5f10159b28ef6a1a583b46e313d/zakudirubuwipipu.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/dc118ce766c5d846286e6e097a95b819/92399026396.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/kaa45bjqgtceqlq45q1ngl3h11/dezerijigawajonisobok.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///74424401210.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/ae32444d551d337bbf0265ba18f3a2cd/35037937288.pdfIn PDF document text
    • http://chobacgiang.net/webroot/img/files/31659715319.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/tenuwitedulevununew.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/poforifamazejuxekinavakon.pdfIn PDF document text
    • http://ozari-ua.com/files/file/kasirojite.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/xewolanuvigirat.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/29193288540.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b1eb69bf819c75514d842ad78a859331/47801770807.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160764e66ce6d7---kofeziguw.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/r7qhc72atbpo4r95noauj0e824/sirami.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/rosojuwagugoligaveki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=ir+spectroscopy+lecture+notes+pdfPDF 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_off00013890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13890 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000150a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150A7 10524 bytes
SHA-256: d93fd6e4da080280f417b6109b4e6b1cba67bc3378b36dffd6018c841523f54a
font_02_sfnt_off000168c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168C6 16280 bytes
SHA-256: ea864ee7dd46250474df1ebdf84e1901f4bcbc3ae9e27c704de532ad94314db3

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