Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aef7bfc723de9b7…

MALICIOUS

PDF

73.9 KB Created: 2021-09-04 22:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: fb5d17dad0ec0724e29483e5152cc465 SHA-1: 3d5ae4482667b697619c8ecfc56b4e9cddfed858 SHA-256: 0aef7bfc723de9b72b26156391929c69fde1fef9d2e0326589ec4736329fd75f
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, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and the presence of multiple external URIs indicate it's likely used as a lure to download further malicious payloads or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=ifrs+15+pdf+arabic PDF link annotation
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/68c887b80684fab07ea4165cec837e6b/jusipiluk.pdfIn PDF document text
    • http://ozari-ua.com/files/file/razevabiva.pdfIn PDF document text
    • http://selmanoglusigorta.com/userfiles/file/mofisa.pdfIn PDF document text
    • http://ipceurope.com/assets/file/kotiko.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/18484601741.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/35139796541.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9025a7527---joludurobozegifevix.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/14501325208.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/lajazodabipu.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa31afba3---33996327404.pdfIn PDF document text
    • http://greenbrier101.com/userimages/kanusalebap.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/37842098356.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/42200540861.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7987c48abc---86064402802.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c866174c7c5---napumezixepekerurimogi.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611301cc1208f---biniguzibev.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608340ec11873---kimafezafefaxapopalobi.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/697672772d91ba67b96901bab574d52b/22296934382.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160812b614f973---liwimisuzinemivapazuk.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16127508663b18---81748582128.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/f628e4fde46f09c0d9d51618b95b5958/15421523485.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/sinagajeku.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/dalurisusifiluvuwu.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/7fab0ab94d6e8fcf5a2d876eada9aeba/tojejotufusabi.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/64645666177.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_off0000ba5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA5D 18484 bytes
SHA-256: 604d6e42ccf5b574a17db00905dc496829952e30f94e996c18a6dbf33c61f4b8
font_01_sfnt_off0000e9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10210 10392 bytes
SHA-256: 94ae196dab6d5d3d00d0658a4a194234b2265d3f8dec462e9ea72b8d1621852d

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