Malicious PDF — malware analysis report

Static analysis result for SHA-256 06828b055146d40d…

MALICIOUS

PDF

71.8 KB Created: 2021-08-31 13:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9c983b757a0f8f4395d45c01734e364f SHA-1: 378902f30d010297d90e9bdb1040fcde3d6ed6a8 SHA-256: 06828b055146d40d46adf6ef880949e40c4d6b84798a48aca79b082f7a722dea
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to a link farm strategy, with several links hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute malicious content or manipulate search engine results. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://thedewakohchang.com/image/upload/File/ilepukidusiluro.pdf In PDF document text
    • http://alliance-ltd.com/userfiles/pidurek.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/31162021596.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/qo0dp2jqcmu3tlnpb4cd3o8c96/26443912067.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/a9e55da9b70e25700b81260d316bd835/vonuvurepapexi.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/dd25dqqnm6nk57ns71dsc4d3a9/77470620080.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/13e97119ec63058ec87b593de3ea9bc6/65680985994.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/41024854977.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/80879130817.pdfIn PDF document text
    • http://mebco.ru/images/file/78833608738.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/7b5d76657052b85821a6eb9831cfe07f/duxobev.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff4eeebfac---bibebemisusamomikob.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fcd9bc725---81789140714.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/qgi3iv0q8vpqreib6ahf41pt37/tijalifomifemapa.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/viganupi.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/bagidoxuzemukofalikijo.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/segofifasib.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b70c56195b5---37757936505.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/48668006833.pdfIn PDF document text
    • https://collegemahan.ir/basefile/collegemahanir/files/dujigelat.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/75623131026.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/28253613842.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=glossitis+causes+vitamin+deficiencyPDF 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_off0000ba01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA01 14956 bytes
SHA-256: df7579087a0a29e387f02dd3ad369b218b4148cd2b2601343f40fa846d6f6842
font_01_sfnt_off0000df16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF16 10856 bytes
SHA-256: 91f90662a1d9e8c2de50ec507c0248554c03fde67fa951d2e8f0ae50286308d7
font_02_sfnt_off0000f83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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