Malicious PDF — malware analysis report

Static analysis result for SHA-256 66a4228dc6fa82c4…

MALICIOUS

PDF

80.9 KB Created: 2021-07-30 03:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 69ed8b4c1c9e32b80afb77fd0ba77beb SHA-1: de843bb566ae818a0f17e693796d4f25bbac30e2 SHA-256: 66a4228dc6fa82c45937f99dc6855228e8f8067015a5bcf360ff37fd362c7c04
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

The sample is a PDF document detected as malicious by ClamAV and an ML classifier. It contains a 'clipboard command execution lure' heuristic, indicating it instructs the user to copy and paste commands into a shell. This is a common technique to download and execute further stages of malware. The document also hosts a link farm on compromised WordPress sites, suggesting an attempt to distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/sb0ljcrh7dcjjfrolghkr19ot8/80138051040.pdf In PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160850b2d52830---83462538296.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/zakatitomewawibef.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/fixovaj.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/files/75677842526.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/60004703867.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/eqdb13o116dkmnbf55l5v7fk04/sitekovaf.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/cfd620e4b4e40b8d634b38bf995f2e6c/wajoxosigul.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/gexemawesebarowewaselo.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/69140481233.pdfIn PDF document text
    • http://broeinest.org/ckfinder/userfiles/files/ligutasuponaz.pdfIn PDF document text
    • https://educhina.mn/editor/files/venunavobeg.pdfIn PDF document text
    • http://abnicum.ru/files/file/walewofamimi.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/29537be75b1fa039a2cda0738c4282b9/51922501899.pdfIn PDF document text
    • http://bruisedreedfoundation.org/clients/4/4d/4d9d7eec3bf3a09fa0457ace138f6a4e/File/81987085227.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/487f00bea3a8e73205ebba9d7bfaf905/wamotunoluvaf.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/bd83d54474caa9fcbc292a1c1fdbab6c/79446587067.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/9msk5v2cvotu0t8hk9leld3s95/tonewakegenevidobepogexuz.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5615deb76---21561250223.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a93252281---wowarukugoxarezar.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/jobisemipenadib.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/3411303375.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/6a3c8367f497364d26b3023e26d2cac1/pedinofalazuzul.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/lulut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+reset+hp+laptop+from+command+promptPDF 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_off0000d965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD965 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17C 10872 bytes
SHA-256: 2d56e684c2e0a16dd7532ec5a284f41fb6bd436263efc454d49765f29ac9dd14
font_02_sfnt_off00010a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7B 16728 bytes
SHA-256: f8d946f4d96941dc4fad3aca8df7e91eb1caaaaf87d4fb1f70db2d27fc82d5eb

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