Malicious PDF — malware analysis report

Static analysis result for SHA-256 4657bfbd76041055…

MALICIOUS

PDF

55.4 KB Created: 2021-09-17 12:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5ffbcefbb0b4ed027518287bc19ae363 SHA-1: e41b4747b7d11a478321a8be573af3cedf1b5f78 SHA-256: 4657bfbd7604105547d0279662af6cfefe044af146c05de413b72c9cf78eb270
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various PDF files hosted on potentially compromised websites, suggesting a distribution mechanism for malicious content. The ML classifier also flagged this PDF as malicious. While no scripts were directly extracted, the structure and URL patterns are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8234

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://americasbestwingsbeltsville.com/uploads/files/nirunomajedegunu.pdf In PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/61938374621.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/babex.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/13482942451.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/sebefulajepukovopolatoxen.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021091619194470554.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/dogovarawivadapamaniti.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344e29a9af8---nuxibuviminegekabuja.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/zogal.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/27456351247.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/tiwegasiwetonejaz.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/pisosob.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/82215985532.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/88538137609.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/aa6fc7e00f9128ae6c7f9825eefcabd6/tipejid.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/98930985524.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bamupeluvumolaf.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/n39mpav2679jic1r4a3puhh89n/84699772123.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/buwalujifulonojo.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109020959292553.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138305182306---vakugo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=android+tv+10+update+downloadPDF 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_off0000afaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C1 10624 bytes
SHA-256: 01ce0523cde0e0fe5329fc5b3015b38e584a579443f2a98ce83ffa5a106a32d6

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