Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c29bf59eef8d7f6…

MALICIOUS

PDF

79.0 KB Created: 2021-09-07 14:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8c951a16d93c070ffdca00acfd37426d SHA-1: 9fd27a1d871c605f19c3f9f829067d67c8775f38 SHA-256: 9c29bf59eef8d7f65d0e53c6a9a1f267f8222defcae362e166bf4180801e5428
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various compromised websites and potentially malicious PDF files, as evidenced by multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The embedded URLs suggest an attempt to distribute phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=magic+of+thinking+big+book+pdf+download PDF link annotation
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/d111d2fac3ac1dce5162b9f944c78a54/lekolizuripinibunaj.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/40679719355.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/19377746256.pdfIn PDF document text
    • http://rayer.cn/d/files/josorebediwemubutivejedam.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/waxamabexaxafumepibojubu.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/8eq602pn54ks024o5kq5ic7pt2/97339941993.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba8c886bca---23843649731.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/mobugokugapewolaw.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/jagenujumunasaxusi.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/bc2533e34a7e1945420e097eef6cd1a6/wefuzodovuvixezepine.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608470a23a0c4---19931306953.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/wumasesiw.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/jhf2ge7eqopmmf3ps2bhdl9bku/ziwobiretoxikubopelakevo.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/daboxebumodidozizeme.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/vogumawavabefo.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/71167187971.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/semorogizesosipusiboliba.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f2d4db82e---pikikosisigigul.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/ritisaxevusavabowotexivi.pdfIn PDF document text
    • https://e-midas.ro/files/file/lisipexepunanuwaxubux.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/47260277833.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1608e52e6bae68---35016016551.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0823/98be99825ca16fcfdc81e91222acb3a0.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/depagufaxupidenoritas.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_off0000d386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD386 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB98 16404 bytes
SHA-256: 72c9beeedd6730f9bd09fd5b236d3908e9a27f9105152625861b13b5dea7517d
font_02_sfnt_off000115c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C7 10812 bytes
SHA-256: ed70c2598d0ab0a2e40ce33fbea3de8bf1b1928fb2bba6ab60bdf8c2c61542f6

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