Malicious PDF — malware analysis report

Static analysis result for SHA-256 83744254fa8c3f40…

MALICIOUS

PDF

70.7 KB Created: 2021-09-11 06:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9d2a526392b88609571fec233c30d89c SHA-1: e1c32b573377a21b3072b68078990c8b0e7fff83 SHA-256: 83744254fa8c3f409fe417a90961ca40006a20a87236ee74006c584f0dfe8113
72 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing an embedded JavaScript stream, which is often used to obfuscate malicious actions. It also features a link farm with numerous external URIs, many pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded JavaScript and the link farm structure indicate a likely attempt to lure users to external sites, potentially for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3323

Heuristics 5

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://clear-es.net/yamituki-n/uploads/files/94884330903.pdf In PDF document text
    • http://njbeihang.com/uploadfile/file///2021090300052797.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/maridupapo.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/152044eff16d782316ba7c91fa388079/91614142634.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/34319873330.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/kedemobido.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/15722330867.pdfIn PDF document text
    • https://successalpha.team/upload/files/83970510124.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/4lgdkfqqndifdah82l5uhus7p2/tanetivitetamexude.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/vusurozadoxof.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109032357152865.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/vuvugozumopifiponox.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/96866087041.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396bfbdce77---78263099277.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/zebunereresuzojob.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/87120614753.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/90121487512.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/gezulewosaki.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/lununikilirozuvezoxesefon.pdfIn PDF document text
    • http://rnralpha.cz/res/file/94486507997.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/buzevetanawevusavip.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/kakubuzonekuwazuwuwilut.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210908180253427990omaseu.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/bokomawiwosefigenoguxuja.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/22747100108.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/zirisasob.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/xejib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=pubg+mobile+lite+free+ucPDF 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_off0000d891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD891 10484 bytes
SHA-256: 770fe53f08f57e432d5ffd7647f31875d1c82b1289c27eabc1559996eab5ea61
font_01_sfnt_off0000f066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF066 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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