Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f99afa57abde807…

MALICIOUS

PDF

80.6 KB Created: 2021-09-01 05:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 39924742b1b80d7504ddef99f9689408 SHA-1: 88b261e3c99b6be42879425869f1c26e20a870d0 SHA-256: 7f99afa57abde807ee5aefcb50155a0cb7209f330840a3645c7ff03e48652f57
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to PDF files hosted on what appear to be compromised websites. The 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics indicate a pattern of using these links for malicious purposes, likely to distribute further malware or engage in phishing. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/3463530920.pdf In PDF document text
    • http://twfindia.in/userfiles/files/ramoxerivolotebugujeg.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/58573050348.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/kowigatapes.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/65559558413.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/rapuxotevesovif.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/61613261449.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/bosezokikusu.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/c7b52c11d19fb11de3de645ced751918/xapogagifituxi.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/74762943885.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/91089660080.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/34401299058.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/gatawevorotumosogew.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/lifomaxirikoxoxowaxowokap.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/95593915911.pdfIn PDF document text
    • http://aven.su/userfiles/file/73656148234.pdfIn PDF document text
    • http://cnp-inc.com/ckupload/files/bonolovilerapibojajaba.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kilogodatopuvu.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/49733195311.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/jirisesixen.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/53536708118.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/7d9e31c96f92f5a57c06880d38b9ef5c/rosajirigeseborexat.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d05c94171dd---sapuxonobutaku.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/98434996473.pdfIn PDF document text
    • http://myafmc.com/clients/a/a5/a51d49d85de18111a3d718c63a5e5081/File/bikopawulejurirefasosivaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=legendary+duelist+price+guidePDF 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_off0000d1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A9 10740 bytes
SHA-256: 5ef6ab702dc53654d1d28a64668c3dcbae4eb2e1e4b4451cac209bffa7fa9427
font_01_sfnt_off0000ea43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA43 18796 bytes
SHA-256: 96edbe23606ae62582d84f0b8cfb8caa277d45d1e322e8b72cb0307666a64575
font_02_sfnt_off00011a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1