Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e390fe214283a2…

MALICIOUS

PDF

86.8 KB Created: 2021-07-19 14:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a4ecf2af36083e5096b39b47d1fb7344 SHA-1: e59463de1960d4a2a59c10db29a35a6b1a7112f7 SHA-256: 99e390fe214283a2c538b4b92bd82ccb0942bd829c75d11755ca433e7407aeba
204 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious. It contains a 'Clipboard command execution lure' heuristic, indicating it instructs the user to copy and paste content into a shell, likely to execute a second-stage payload. Several URLs point to compromised CMS upload directories, suggesting a pattern of hosting malicious files on vulnerable websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/55hatijmhn2usb5h8o3s67ps65/48188506050.pdf In PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/22109800774.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/53611567210.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/rurujofubu.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f45a786f59c---radizusawuvipagom.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa0e41bec5---suvikugita.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/92590844250.pdfIn PDF document text
    • https://coil.hk/upload/files/40778188315.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/34363864627.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/74211570871.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/56690583437.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/19637531994.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/e5e81ec06c6466f84ecb29cdc8aec03b/degoko.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/gabizukob.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/decb1cd60f1b0a7f86f8c2fa30eaef00/faduveloreziwagometoroj.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c71ff2c1639---loxifarefov.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/rafonamidobevolisititajad.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/56365165989.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/37855538221.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075c7d1be361---32659797207.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/52402724277.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/ktblnptna86h9mh1s375ajaekl/rurenoxezarofu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+insert+pdf+in+excel+365PDF 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_off0000efa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA6 16920 bytes
SHA-256: eab5e1ac53474458fe839f81735c9722e29c53ab1b6bb0a727cad45d315d81a3
font_01_sfnt_off00011bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAE 11104 bytes
SHA-256: ef8505b037473304fe918589a952c3d3eaa0c659535d6c3390b25848709a15c9
font_02_sfnt_off000135c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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