Malicious PDF — malware analysis report

Static analysis result for SHA-256 8766bda62d1f445e…

MALICIOUS

PDF

81.5 KB Created: 2021-09-05 01:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d20701e155e9766d5ec1bddaf96bfaaf SHA-1: 7435750038b1c89f25e318445fa42d29b8a4fae2 SHA-256: 8766bda62d1f445e5fb23082841e8c007f6e94b47f6ee804c846ebda020d6b3e
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains phishing content. The numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggest a link farm designed to redirect users to malicious sites. The presence of these links and the overall detection by security tools strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://ketchas.ru/uplcv?utm_term=tabaquismo+consecuencias+sociales+pdf PDF link annotation
    • http://holdemigny.fr/ckfinder/userfiles/files/82876171205.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/patesililividasupadizo.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de15e617918---571216297.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d65ccf402f---78478299574.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/17603108642.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/mamelero.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/vonenibatefewufijitatij.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/981e6c8aa8d588c781aa676a3fa6c1a3/mumetanubimi.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/28979ad0dbfcc3aa4b26fc2b0db4df0d/vozexuzanefawuwunuvor.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/jivivaw.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/boramute.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/0752c5a0e2b6379faa6ce5cea7ed5871/papufakoberun.pdfIn PDF document text
    • http://debden.org/userfiles/file/saluxan.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607112d03bb08---budamusuwolidirazavewuni.pdfIn PDF document text
    • https://lazerom.pro/media/file/70515888951.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/27105741858.pdfIn PDF document text
    • http://churchillreunion.com/clients/72216/File/tijijojironeg.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/cnikrhd4l8ua2rcsb16ug9o0oh/gekof.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/98738325868.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/30845644608.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/53918421874.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/xeroviwakexap.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///kifotidu.pdfIn PDF document text
    • 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_off0000d855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD855 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF067 18488 bytes
SHA-256: f9a97615053c845794785c46c2140cc7f3dad56c2e485bef239b2989eb22ec90
font_02_sfnt_off00011f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6E 10932 bytes
SHA-256: 4f869fa9b711d1f29194298b382bde7ad8865b5404ad57bf99e6504c4ce4197e

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