Malicious PDF — malware analysis report

Static analysis result for SHA-256 b96f388a1e345637…

MALICIOUS

PDF

77.9 KB Created: 2021-09-01 01:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d7daf66475257e2a35321f5b201b95f7 SHA-1: ae70fb433eed73f70ce339e81a25f52d1bd98e3e SHA-256: b96f388a1e345637fcb6dbee26a9f0093e47fa37df6dbe2acff87625a184abaf
124 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many pointing to compromised WordPress upload directories and other disposable hosting. This behavior is indicative of a link farm designed to redirect users to malicious sites, likely for phishing or malware distribution. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2890

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://insinkerator.us/images/uploaded/file/91913360741.pdf In PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d42f287283d---90478416733.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/xapadajoxapuviwejiwuvo.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/zimepepafuxiji.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/90525881432.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/7c18f24c77200ea86ebe505a15b86a8a/83776156861.pdfIn PDF document text
    • https://bloomeng.com/uploads/tuwopoloze.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/813d811d29e17c08efd2ff5565ed209b/mufudodub.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/26499769657.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/28562786951.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/94899166101.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cba52330e7---46814233646.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0315b063df---bijasasevubijasetek.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/2d869614f9915410e82b876476786e94/77957325222.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/18553117327.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/2ea4c96ce155ff0b940c689ab9e58a45/68813926092.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/gimorofegavanegiworava.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bccc5987517---fejim.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/wolof.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/gawapike.pdfIn PDF document text
    • http://shopexpert.com/app/webroot/files/userfiles/files/36066295187.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608579f55be2f---73120948203.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/71953222837.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/39269307800.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/mf1o7sjkm2lljtlg3d5e5d1bjq/lurofezaxalinovezogadom.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/0dc6a2897f473c6069380b500f58d129/61569586769.pdfIn PDF document text
    • http://martonelektro.hu/files/file/24756368487.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=lord+of+the+rings+trilogy+orderPDF link annotation
    • 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_off0000de0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0D 17848 bytes
SHA-256: 2124393c1095d190d2bcbd0bd9ae9eb631185eb44daa32480a5ca5858fd84fee
font_01_sfnt_off00010c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C50 10544 bytes
SHA-256: 8b452dbd0ac3e865f5ae8f632d43af40af9d33b5d392ba8fe58b1eaef0e5f08d
font_02_sfnt_off0001240b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1