Malicious PDF — malware analysis report

Static analysis result for SHA-256 e682cb60475315d0…

MALICIOUS

PDF

80.4 KB Created: 2021-09-02 04:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 550cc240fe8a50535fc0d82405615f08 SHA-1: 7c95c0f678f6665471fbd8ea62f89195ce0749cf SHA-256: e682cb60475315d03199163f2cb8a66654daf2218692a84d76a7f4ebf2950b9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high score further support malicious intent. While no scripts were explicitly extracted, the structure and link farm nature are indicative of an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 https://chcial.ru/uplcv?utm_term=uti+strong+smell PDF link annotation
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/d938h7l018j44737uf5hnai52t/8059384839.pdfIn PDF document text
    • http://apple888.vn/luutru/files/78062876657.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/tekunirape.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/161298ae486e9b---sepaxekawerafipiba.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zugufalatoxu.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/12538027941.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/03741637998774ad05eb8c2368988b79/mutozosuduruganalovur.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/demudaberamulaveped.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b0dddb1770f---56767436202.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/a7f6cdf78177a83da7c77cb52fce0d15/pakodalewagamixovow.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/vubupaxekamemotopirumuge.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/71334703843.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729a870777f---60171815791.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/wanezipefegup.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///bobik.pdfIn PDF document text
    • http://www.heksan.com.pl/file/70080119322.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/6947381488.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/14476437725.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/josejaxe.pdfIn PDF document text
    • https://genegurumiraclehealer.comuserfiles/file/56982781507.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/pvoleo78oe1vsbia5p1rufq1t7/49680763806.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/7d7e3a26a2a0ea045ef4b138154b01eb/nigeletubado.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f0eca8eacbc---gureribe.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/75501345014.pdfIn PDF document text
    • http://zuche0551.com/upload/file/totililalovabuvegetetases.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/dbf0b8841522887101f676adb4a62667/laxodorujuror.pdfIn PDF document text
    • 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_off0000da11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF223 16516 bytes
SHA-256: d081d25ed266133c1c202274eb52222d508d6e50e2a1a9f5268dd958d85c2844
font_02_sfnt_off00011c71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C71 10296 bytes
SHA-256: fd20c654fcf7f2691d43d29d583bece27bf3b551b34a5af1614d70c1c7e9bc2a

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