Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc6acde927e45009…

MALICIOUS

PDF

86.6 KB Created: 2021-09-12 19:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b0bb1bdd9782149ee747bf6a9743d1ab SHA-1: 7c15e5e5d3f643fe8e6a068caf6d02b3b242334e SHA-256: bc6acde927e450094d93719dc55e26f56f8571406f1c7c9868ad244b30d3a228
196 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan. Heuristics indicate it uses a browser extension installation lure, a common social-engineering tactic. The document contains numerous links, many pointing to disposable hosting or compromised CMS uploads, suggesting an attempt to redirect users to malicious sites. While no scripts were directly extracted, the PDF structure and heuristics suggest potential for embedded JavaScript or exploit code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://soc-in.com/data/media/files/rasotekano.pdf In PDF document text
    • http://rund-sro.cz/UserFiles/File/widedusudifirojumege.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/wewesexiwajativilurap.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/fuxuruzaxosopope.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/lagisipodafedun.pdfIn PDF document text
    • https://10fci.org/userfiles/file/58651935036.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/suvitifegin.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210910135214.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/52918750817.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/37413f71d818360393d9cf618ba00728/viwiwebonigik.pdfIn PDF document text
    • http://ingore.cn/upload/files/kirokadavevarotutovurun.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/1cbfb7b8a5b4d1bd6feda258ea01b178/tufami.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/35544441428.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/94984698653.pdfIn PDF document text
    • http://szwygs.com/upload/lexasikapibakolulufabi.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/2563544830.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/wabesifotamasonob.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xuguboruzaxozijirakamuso.pdfIn PDF document text
    • https://bursac.net/userfiles/file/lamomujonu.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/76797367936.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130fbc245380---doloxajariz.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d98c6044b3---sateten.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/danogowezebexidumag.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/jizojejowalabuwitozelilu.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/sopakusope.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137da1700439---22384483068.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/xepofuxuxozaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=best+pdf+reader+for+pc+freePDF 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_off0000ef49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF49 17560 bytes
SHA-256: a82a52fde0fdb6c0b9d4175dc6472531c7da12fc3c882cb168c388eb87e336a7
font_01_sfnt_off00011cb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB1 10424 bytes
SHA-256: 56892e5de8635f7a5b237fa5c50d92a4ed9d3d72a3347ba4d8c3355cf8084c04
font_02_sfnt_off00013482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13482 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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