Malicious PDF — malware analysis report

Static analysis result for SHA-256 344d68eb800b47f5…

MALICIOUS

PDF

80.7 KB Created: 2021-09-18 05:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 78b157b8ec6804eb774c01b11115b2ac SHA-1: 92b9c7183508a89ad3cc296002fa1866f031de6b SHA-256: 344d68eb800b47f56c0da2e2840a6967219cbb2bd8412a136fc3ee3293e66c3e
136 Risk Score

Malware Insights

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

The PDF document contains a lure to install a browser extension or update, a known social engineering technique to trick users into compromising their systems. While no scripts were directly extracted, the presence of multiple embedded URLs, some pointing to compromised CMS uploads and link farms, suggests a multi-stage attack. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.tocbirsen.org.tr/ckfinder/userfiles/files/27598418803.pdf In PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/6189da538a91f01539b050b7b8452955/dapabadufax.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///65126297097.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/91994399191.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/1f09ae595374a6b8135c33e37caa8912/56203706838.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/xinetiwapabutawakulirede.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021091514332273499.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/3828057815.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/22489074340.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/65449061054.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/7530596752.pdfIn PDF document text
    • https://fix2go.info/userfiles/file/mimexidimewixobizirivax.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/nupiwatuv.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/22004407816.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/78365210935.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/28803320159.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/vibafotifukagevisap.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d98c6044b3---sateten.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/49596846874.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/21992739782.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/jezineliximepip.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161434a808c8cd---rutuk.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161341f1de19bb---27640849928.pdfIn PDF document text
    • https://festacontinua.it/public/file/zovogemovuvusunez.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/weveto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=chrome+history+shortcutPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000d721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD721 10428 bytes
SHA-256: baf6de5bfb54f457f78abf466c4e18297cdbae846f3314186c1f51747b9bda79
font_01_sfnt_off0000eee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE1 18028 bytes
SHA-256: 4168adca15a66248c112eb42f0f5480813bcb4e0a797327cccfed62e353ab303
font_02_sfnt_off00011d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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