Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff2decc28f0450e…

MALICIOUS

PDF

70.0 KB Created: 2021-09-22 11:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 617bc36a1279b3b3ab7feca4959cfad3 SHA-1: f127963698ba2aa16c6e9a9d7513526a99dab923 SHA-256: fff2decc28f0450e5cfcb8122e08f571bdbfa1414fcb4d3d6777cfc280ada65e
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://africareview.in/userfiles/file/95769471451.pdf In PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/30120258.pdfIn PDF document text
    • https://digireg.at/upload/52850889434.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6383f23b5---galosijowipa.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/wozixumufelu.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/tobolitekuwexodog.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/4192326748.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/rotefipizumawixub.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/50637676817.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613710d085ccb---wudisawow.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/70619849583.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/34013720391.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/rizinavapimurazakoletum.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/komogefizawixaku.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/98863927041.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210901070501.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/46141941949.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/radeneta.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/22498731895.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/vefeduzikixod.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161461df70dbac---58636935189.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/bunizuwumifurewoju.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/zetatirogoneninifibosumew.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/lefekivududevo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=inspirational+words+beginning+with+sPDF 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_off0000b33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33A 10848 bytes
SHA-256: ac38985c9cc346dc1b0fb80be9bce1484fce2043a8d4d887e413c1ec2c8d4a38
font_01_sfnt_off0000cbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCC 14960 bytes
SHA-256: ca7b28f6f4c21f2e300289670148ba1fb7501f4a40e655b810589b0274f1d662
font_02_sfnt_off0000f1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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