Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f420300938ad464…

MALICIOUS

PDF

87.4 KB Created: 2021-09-03 18:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0acf48d1c898da54f63a5e9a3cb63995 SHA-1: 9cd1791732ff734be5c2f6962dff266e7bb9c94d SHA-256: 8f420300938ad464a9f820802ec762e09477c2c069f70e0a09efd6b78354c005
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other domains, likely serving as a distribution point for phishing or malware. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://medvor.ru/uplcv?utm_term=divine+comedy+characters+pdf PDF link annotation
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/a2b94074649060b38e159d460b15ec2f/jukedusilubuj.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/cn7sb2riqeadvleref31bdojca/1190181253.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771a1f81741---danisujirutiji.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/18cdlmr7s9lhhnbc90q96o7kgm/xivefiwer.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/78260588483.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/26952641518.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac70915ea53---41227630028.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16089b5d494e6c---tonixemojowikadekilov.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/61604754073.pdfIn PDF document text
    • https://businesslife.com/content/files/23779709274.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/tobunawalimug.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/62635361485.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/81823061186.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/sepovonaxojomij.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/hdgf1f3sdn82474nk8cq0abnff/mobarefivelu.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/8004f9a07742cc0cf4756762be0c2dbd/xitatajir.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/69694231786.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/32380104927.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/bikavavorarenilut.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/nopev.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/72004de10bf87b95558d8e10624023fc/xiwofi.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160700ec0852cf---lodekefi.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e215906e4e---zedugosajilafariwejebeze.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_off0000efc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D2 18300 bytes
SHA-256: 0d611c54f319d9b6f7e1926ffcf8a22b3e4f9785f0b54eb15a80045ac901c21f
font_02_sfnt_off00013701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13701 11020 bytes
SHA-256: 63a6fa3b0c564a90e59719ff8e397fab577341cc28ad5bcb8f9cb39cadd1cd44

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