Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e9dfe390cb6fd3d…

MALICIOUS

PDF

91.8 KB Created: 2021-08-12 23:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 0ff429bf49f57ecc1381dfe5e262686d SHA-1: 07b1e76e7cc37a216a63f1bfc7405b07b67c2fa2 SHA-256: 2e9dfe390cb6fd3d99c0087d5b402c79cb3f5e61af2006fbb7af8c90a71734f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to obscure the true destination or leverage compromised infrastructure. While no scripts were explicitly extracted, the PDF structure and link farm nature strongly suggest an intent to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://romanakladatelstvi.cz/userfiles/file/gutitevajovuvapozozi.pdf In PDF document text
    • http://elateridae.com/images/FCKeditor/file/taduxowudufi.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c591f2e33---11037806753.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/pekudevife.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723b774fa66---94937697225.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/853f76f367425e51a5af845e23f93e1c/95727514135.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/25602295532.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/2134882112.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/3375e3a59ecba50262a646a8a29f929a/79133082712.pdfIn PDF document text
    • https://mattress-leader.com/media/damulinotelonesoworef.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/ef255947b8c41540a50d83138a29c123/jinadud.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14c2ad387d---4542599904.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/sidcmr10e0vl80vantug3vit8p/vanotatefe.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109bb5c1a063---70985422139.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/6807622835.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083df0739a36---xatudojawusoti.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/7548225325.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/lulorutezejazorunukimatur.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607405b341f95---27568084873.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/muxawosapepozinujepip.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/futuxumipamid.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/govomuvizubobiniwutujuw.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086af2f29dc9---64588056186.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/xavurumakutol.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/potuluwomexukuxuvome.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/2mgidue92tru517nc7nf5grbdq/jajupadepezinasoj.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113022f76906---zasel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+many+questions+can+you+miss+on+cpc+examPDF 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_off0000ff4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4D 17820 bytes
SHA-256: 33a8106d1b60013fec00ed6b52e2781abbafb7dea96fe7676a407c13a623f405
font_01_sfnt_off00012e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2E 10928 bytes
SHA-256: d3cd3970931236d4849b5a777d05d60b944023df0508293261c5468e46fc06fa
font_02_sfnt_off00014795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14795 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1