Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b8ed37b581e7032…

MALICIOUS

PDF

82.5 KB Created: 2021-09-05 17:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 301fe178a80cc3ff97361d5f46912ff8 SHA-1: 331720b95f13ed0f205974166ddf63e27e76e02b SHA-256: 8b8ed37b581e703240a6f9526299a5e3f4ddc85e984a16d3b56981f8e302aca9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It contains numerous links to external websites, many hosted on compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and embedded links are indicative of a phishing lure, likely attempting to trick users into downloading further malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/4ba3b66329f4bcab6546e48e05a96a36/72857075753.pdf In PDF document text
    • http://busangh.com/attfile/fckimg/file///202106191067_700430618.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/pabapapo.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b6f70f82b---70595851883.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/40010720603.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/gozejubezexuxubebodod.pdfIn PDF document text
    • http://wagnerfamilyreunion.com/clients/866685/File/75713175619.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a1581c57ae889e38aa066571f6f5af67/fawuwujibalepexutebix.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/a9ad765552df263682d7fc9baa94f8dd/23805308577.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/91479798372.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/97599537976.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/gisibasizukupumu.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210829181046_eh5oug.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/muwuwewobu.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073525329bc5---zalutoronose.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb5a70945c8---57702441178.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/lojakozuwu.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/wizumutofuvefotijax.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/bedefivinokadefeko.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/gufuwesepoxo.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161310e9cb15cd---30150405330.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/81823044495.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/74827982032.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/zefurukisesorovomalitad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=tratamiento+nefropatia+diabetica+pdfPDF 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_off0000dc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC68 18232 bytes
SHA-256: e841673ecfff639b8e94b07de63c52c142a40bf1896f40503226473a002adba6
font_01_sfnt_off00010b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B0 10672 bytes
SHA-256: 3a537c0bc6962be419d0ddc6d392601a5937422ed70aa9436c475bc19ab53a31

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