Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e2fc3b886755732…

MALICIOUS

PDF

99.4 KB Created: 2021-09-01 05:20:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ea0f308b343369a7f9fbe3df416075c8 SHA-1: d53e07ab2d1a6b0c98d8fffcf339945e8dcdbd20 SHA-256: 5e2fc3b88675573262c3c6bc1c079b2439213041e7ea760982e611f6ee8cd7a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it is designed to lead users to malicious sites, potentially exploiting embedded JavaScript or other vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://taichielite.com/louis/taichi/ckfinder/userfiles/files/11005782758.pdf In PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/148a11406cbd138cf7b85dd3774d37de/50003993928.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/651ml1p3uk8juu3e0j20jkhvrl/mujafesaxodevi.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/giruxitunu.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/750715fbc68e62b2976fcc74bd71e34d/vufunevezatalesigike.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/42576124382.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/502a644b7cbc83d193a36e2c4948042c/vezojupuwaf.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/202172492728.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/d9d5c69d1caf1fa8d682d73594bf749d/redaxebifo.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/76m3eiqhk2kbiajsuie5b7hkl4/31170772352.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/temipaxafija.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/a0beba22850e6a711c0b6531f2caf477/nipikubexerujiro.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/99305158091.pdfIn PDF document text
    • https://berbagiangka.com/contents//files/firadefomuvixapoxapo.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/38365851739.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160841f24eb087---95233356918.pdfIn PDF document text
    • http://www.bandungmesin.com/file/denavipumulokos.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/80891952714.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/rrc95529qc9llkqtav4fmnh3t0/40853125530.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab85bc84cc1---45039435973.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdaa8dce5c8---56529323470.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/qaskh9sgt1b8at6boia801sl7u/38094633478.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/wemuvoropodijujikizirun.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/02c619b947fb62969043142e3b46a4b9/41752092157.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=36+pints+equals+how+many+gallonsPDF 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_off000117b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B9 20008 bytes
SHA-256: bcc8864539777d728e3084011f675e170e221361c599d262f3ee96ee2d03e9ca
font_01_sfnt_off00014cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001650f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1650F 11288 bytes
SHA-256: 1d10857169c6d6ee52390cbd5eec483eabaa08efaced69e4d9b4131fd00c3e4e

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