Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd3c088c0d7ce81f…

MALICIOUS

PDF

77.9 KB Created: 2021-09-04 10:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 979fa7e36df77854fe66de1826590548 SHA-1: d859dd4951363e206579121a165f42974fed1083 SHA-256: fd3c088c0d7ce81f32322ba6a86a58f61e3b85ab7f0a6d47ebf556eb270ff2f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links pointing to various domains, many of which are hosted on compromised or disposable infrastructure, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a campaign to lure victims to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • 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.
  • 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://qianlong99.org/ckfinder/userfiles/files/49855540657.pdf In PDF document text
    • http://playeasypiano.com/resources/fck_images/wopafu.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/xobafumovilidosupajap.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/88408906926.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/22975462101.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/3e285dc47db33cd7127177c13d45e892/7838230736.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/venavulipozoruzageguminud.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c778636b2d---gerurupum.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a71e077a58e---wowesidubigekaz.pdfIn PDF document text
    • http://foodchemsino.com/d/files/pikotidifokadokigekituzu.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/mozomalizadapafafidolon.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607945a62cef4---rasojapuxenomomimuxifer.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/8551697630.pdfIn PDF document text
    • http://judge1960reunion.com/clients/873273/File/bovigobigineto.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/11989730108.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1610903a548ab0---49798046659.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/nanumipinagelijarorupago.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/gezurodopepaxoxavi.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/41252730113.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/sn2inqkpd65d0vmq5q95g9i2kh/xesaj.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/dd6f5d98d4c775c7154ea7d2c408ca1c/53860548358.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160840199111a8---54864331122.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/digefejebaxu.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/97792204236.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/datopijaperiwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=climat%C3%A9rio+pdf+febrasgoPDF 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_off0000c8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CF 11064 bytes
SHA-256: c0624ad73d8ee02b14ea72de9808211c5458a9983a874584976032a0a4820c8f
font_01_sfnt_off0000e1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D7 17920 bytes
SHA-256: c26b474737270033b88a505a7f0673273d5f6f26e6693ead3890bf5966ab62d7
font_02_sfnt_off00011076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11076 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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