Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b8effce60d0192…

MALICIOUS

PDF

85.1 KB Created: 2021-09-20 16:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f6d13d5a49c028d598bdf4a9d1753dac SHA-1: cce68ad91c0fbc3e935730e275298a34c1e1d672 SHA-256: f8b8effce60d019210681de7d2efecf517aa6a7046637b928367ac566d31a642
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting. The primary attack pattern involves luring users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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
  • 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://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87917151201.pdf In PDF document text
    • http://mega-treid.com/userfiles/files/tumib.pdfIn PDF document text
    • https://sona3elkhair.com/userfiles/file/pabenaxaw.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/dipuxamaka.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/36107783974.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/zokatoj.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/bezadew.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/zosuvew.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ddcb00ae0---545765965.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/34078759662.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/modupozepuxizamejuwusuv.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/simidelena.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/puguwivaxabusufudalo.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/o3ggjbqhea7rcf7odchallv3gj/ruvolaler.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/1587252950.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613662c6dcc72---60099151972.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/90736045552.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/77200222132.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/403452638.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/najuzojet.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/16293368646.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/49089562042.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e0b2f1d79---34745130442.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=emulator+android+32+bit+ram+1gbPDF 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_off0000e409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE409 18880 bytes
SHA-256: 73cde06eb6980e4f20986dc6049acf1d15b5cdb4392207b5261a354e8416b0cf
font_01_sfnt_off000115ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EA 10860 bytes
SHA-256: 3b2da8c2177d0ff8de78f0353912ad9c0aeab1e7a1df84d3d4192339f3f51393
font_02_sfnt_off00012eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1