Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a5bfa08ab9e1208…

MALICIOUS

PDF

90.0 KB Created: 2021-07-17 13:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f87911b56d731eccbe97c73b4f94dc87 SHA-1: b1fb8ac08d608234ae29745a9d137b278f484b53 SHA-256: 5a5bfa08ab9e1208992cb38df78f3882893458ad7db58c9f492b4bb97c1c9a7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the conclusion that this document is designed to manipulate search results or direct users to potentially harmful content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160793b43984da---44620981963.pdf In PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/684c1bca4296bccf99f1021028192497/lewigigagutojigozewumaz.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/tagubijipez.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/muvewedab.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/dofewusonademunopese.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/56692363322.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbadb5135c---77298742744.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/8hq8ddg8vvmn3nctd9uue292qd/xudezutigewi.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/6s144big9ee057au6cg3iff59u/86657316036.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087ab9b4e194---baber.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/cb9996143683fc796fbe0a67d6467e32/27577639460.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a003b274af---ronuvejimut.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/m6v8u973rn63102cpej1oi4gtr/76186731783.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/36721018843.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/30603102012.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ba91ed208---xaninisevamum.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/77290828617.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/7dd377db5d59bf108ce1b091d298b3f5/59297910665.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/46022955096.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608e104f26fdf---xifawomuruzenol.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/40377939977.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=great+depression+and+new+deal+testPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/37142071675.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_off0000fdb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB4 16712 bytes
SHA-256: 75e62dd263da9dfe33efbec4df857f1161141322114fe6f1d41e1f5d0e33db6b
font_01_sfnt_off0001292d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14144 10508 bytes
SHA-256: 3f60be22f5b73e5e86d8d6523185aa63afc55d40543daf140a74481014b71922

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