Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc8135d114b761b…

MALICIOUS

PDF

71.1 KB Created: 2021-09-19 02:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5a87ed4be39fd5cdb02f67a44dc312dc SHA-1: e0039745af238943aaa1f92e0b0ca3f71a693793 SHA-256: 8fc8135d114b761b0dddb3812cf34294c7112cd32bce3f3699c508c2efa5dffa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings clearly point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://gniortho.com/files/Upload/file/pagaxofet.pdf In PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a39fe9cdb9---65977219906.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090621284759.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/bfd3ed9c6d7d6d9d6f71f0b1b9e7ac00/27176390814.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/90071769929.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/zaguvamepo.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/zakaret.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/xapatul.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///mamutenimubow.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/tobanajigepuxe.pdfIn PDF document text
    • http://whatdwellswithin.com/file/59997261633.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/jiwodarudabesid.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/vinajuzonaxabagup.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee6b2959a5---pejik.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/mevesevotenopaxuma.pdfIn PDF document text
    • http://demo755.webbazaar.com/uploads/vajemojakowusapofirowumir.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/finonerebi.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1612fef85d59ae---vudapo.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/13520794835.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/lopiwinubiwuk.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210916204605_1894652735.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/gisuzofevogok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=head+ball+unblockedPDF 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_off0000b7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F1 15716 bytes
SHA-256: 97c711d13bf27101919d99d1bb5d6ccc0f6deb9e0725833034d38827829f0bda
font_01_sfnt_off0000dff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80B 10228 bytes
SHA-256: 466cdd356b0db06b31aa2f6e1cd4fb4e6828d48e6df15320bb1a4b71fb66f040

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