Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aef07d5f1f72213…

MALICIOUS

PDF

80.6 KB Created: 2021-08-25 09:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6eba807e79a5d904c5fc02267a9d57e5 SHA-1: 06f019668f80f34121186a5268bc3e891e270d3e SHA-256: 8aef07d5f1f722135a9f31617f7b1927ad74271e6ad2a91ce9aef1ab0dc25fe0
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, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress sites, designed to appear as a download source for software. The embedded URLs suggest a phishing lure, likely aiming to trick users into downloading malware disguised as legitimate software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://pixomot.ru/uplcv?utm_term=pdf+editor+software+with+serial+key+free+download PDF link annotation
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/29fa6854261d62c386e4ad45418b4c44/29868969500.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/d90a36ca8aaddf7b903706383e25ab51/tasuwuturalutewokodike.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a80d216a63f---towowipufenavometumam.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16110df5b0d3a8---setajejizojanen.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c229a4cd70c---zigir.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/nunibipiburesugorumawum.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/jojowun.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/23759579857.pdfIn PDF document text
    • https://bursac.net/userfiles/file/sakapidexuvut.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d45adda6451---biwod.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/f1972442092ab25877e087e41e2adf0e/34735538409.pdfIn PDF document text
    • http://qca.ch/userfiles/file/3721231828.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f7d70bdbe---retudavaw.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/kibodimunitekikatusejawil.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/sufirufa.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/6d842b0a0e1e80661a29e44c17b09572/30267456470.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/90672823905.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/mopesodokufawab.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/27821209981.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9effba427---73919227723.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/mijejesekunit.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/xoxaludevoxifibuzuvije.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/gomujaratem.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/sugevoxi.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/ogkmuufdbq1kqsboi3uojbk268/26103005596.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_off0000d7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF9 10744 bytes
SHA-256: 8cd7e54b1e6b812dd299ca29b70eb970173abd496e3e441df1edb4a50c637407
font_02_sfnt_off000108b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B0 16496 bytes
SHA-256: fef6f22a4ed3e9191125155f37c44d4785800a38d63f173ef6c66fccb68b2957

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