Malicious PDF — malware analysis report

Static analysis result for SHA-256 89af44a2a667279d…

MALICIOUS

PDF

71.7 KB Created: 2021-07-10 13:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 78d64d7da69926ac5efc2826088ccd1d SHA-1: 0da43f586d36c3560e08bd6154ab112f9d2cc2cf SHA-256: 89af44a2a667279d210a02351ea10ad1bddba6c3840ba071018f88486bffb672
94 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress upload directories. The ML classifier also flagged this PDF as malicious. The primary attack pattern observed is the use of a link farm to direct users to potentially malicious content hosted on various external sites, some of which are on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8413

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 https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160bad45c0e59a---62082822719.pdf In PDF document text
    • https://pt2-turbo-j3t.com/contents//files/papexokub.pdfIn PDF document text
    • http://beiks.info/public/file/2989814329.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/suxak.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/72751504433.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a26a20883d0---ludewapiruritepe.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/3781633377.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/2qfta2mj19gprglnuhbfitqoqn/86792095633.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/65444405604.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/63bfe3520752e927a5fd2cadf4badc46/94686591000.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/42117906236.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/o7kukh9p6s40l1emgipv19k02m/gegilonewitumobukomixuv.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wipesuwerivesonuwat.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608d47786d949---gunakowusuwedoju.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074884ba90da---16099403000.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/9930d4e15d4ef53cb4c27d1e3db00d8c/96807146395.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/livas.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/58401166447.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/f4285c0ec518c78943463769cf5c2041/6245630988.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e914184e9a---dukagagexizivunidumav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+do+you+ask+a+questionPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1