Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd6aadd17ec230d9…

MALICIOUS

PDF

70.3 KB Created: 2021-09-02 15:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d28123abddfa3644e900a92b82deedc2 SHA-1: ab4b2e15c049c61f2ce0095866d4b98d1507758d SHA-256: cd6aadd17ec230d94ef6e64852ba40e7509a3bcff612a5e62f770c1371c45c5b
64 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many of which point to compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms. While no scripts were extracted, the structure suggests the document is designed to lure users to external, potentially malicious, PDF files hosted on compromised sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4393

Heuristics 4

  • 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
  • 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://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16100d14218180---baleselagodukov.pdf In PDF document text
    • http://naturalmis.com/userfiles/file/pulumigavukivokum.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/foxatarotigilibena.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/41336885679.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/kusababebojer.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/40183603879.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/4cd153dd7f68fb92c93f8ed294ce2f8d/rogakafuvetegokiduse.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607600876d143---pivadimifovi.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/xegenazofidanajap.pdfIn PDF document text
    • http://meskerjager.nl/media/files/73382537567.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/werexuj.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/ruxowelufabutawazige.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/ab5e4451724891456e4175d135a95d86/ketipamudagoza.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/4be1137f0b1fd2bfe22d1258f0f01b8f/27057743407.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/30777733179.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/ranewimetage.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/fexikamix.pdfIn PDF document text
    • http://ymmicro.com/files/files/gedepotezulixo.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/483f014bfd50c9813bf52b01a1ce89e9/92793461956.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/nojomibiduka.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/risuxusevobafifinujume.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/xajujenudusoligati.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/83851639614.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=elements+statistical+learning+hastie+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D2 10932 bytes
SHA-256: 2beb6410dd193c18771dbbaf64e8edbdde68a497d1aca388b8c6f2ce7b1518bd
font_01_sfnt_off0000fcae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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