Malicious PDF — malware analysis report

Static analysis result for SHA-256 7228de0f806a5520…

MALICIOUS

PDF

78.8 KB Created: 2021-09-06 08:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 45d1cc9ad06630ac24d3d9bc64c1a425 SHA-1: fd8e6d58979c5ae372f9690f234155dcd8a04f0a SHA-256: 7228de0f806a5520f2c745a8869f58f541f61b2180b8d51dc93afe34bc691921
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to various PDF files hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://agrilaui.com/userfiles/file/retadexijiwe.pdf In PDF document text
    • http://birnagarcollege.in/userfiles/file/53248572615.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0c94mnd078av84iueddtb4ffs6/58314818707.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fuzirewedi.pdfIn PDF document text
    • https://digireg.dk/upload/58983927720.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/82336369666.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/711ptl0lrqji75dkjio7tgg9eo/2648129865.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/b76149306437e92eed56b0ec0000b098/siwejitisubusefanif.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/hoilflj3bb2sr2h5e5lvmnu7o9/razagogesiwiruvewatapi.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/2676426745.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/51763591739.pdfIn PDF document text
    • http://haai.org/upload/file/titulemetag.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/xoxopojexepusopix.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/47616577955.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b52a99c3696---kipabemiferakanide.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/f9402c5fed61cff9a6a3b2de1ff4a529/31319716750.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/kinaninuka.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/bukakewikejalolezuwivifuz.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/37821197698.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbcd3bafe3a---parurisuxegemu.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/lasidaseziziwinedigefowin.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210505202058732316833.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=marriage+registration+form+pdfPDF 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_off0000cf88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF88 10788 bytes
SHA-256: bdaf6e09bb54a2b94b10dfe270827eb479bcb03a4f26f1d5fadc94df46fe334e
font_01_sfnt_off0000e82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001003d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003D 17536 bytes
SHA-256: f0b292877d1898f294daafaaa12c56eee9d8e907f14343f0b68a3d13baca837a

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