Malicious PDF — malware analysis report

Static analysis result for SHA-256 7201b9cbbf8e55d1…

MALICIOUS

PDF

76.4 KB Created: 2021-09-01 01:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ba68ac8f6bd01fa92f73612fbfb12a54 SHA-1: 310c924dd751b7ff29e542d473d8cd6b1e198d3e SHA-256: 7201b9cbbf8e55d1c54fd99e072789ecea2eb6f9832552fc04693cb8225bad43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://laborke.ru/uplcv?utm_term=find+the+area+of+a+regular+hexagon PDF link annotation
    • http://zoltysnieg.pl/pliki_wyswig/files/64283319686.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085c46cecfca---24194896290.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/3cou9d7g54o1f2evcaa8bfate5/xazaburavugomexej.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/48204705861.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16080802922a90---fasipozuzowolasafosikoz.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b27de777e60---rakuturofarixusewegazo.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/28580750702.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/61459081124.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/ramamupi.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/tixujo.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/buxuravezofipeme.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/kovokibibodage.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/c27ef7f2115e99e49c2142a6b0e3a1b1/91188084316.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/lupog.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/kqtea0ojnmb5n0lacc1rmse6qb/gukuzupudezijepetedu.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210826044226.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/vadebanesijun.pdfIn PDF document text
    • http://tcihk.com/userfiles/mituzejifabasif.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160890b08b5043---xozosuvufitiwaduzuled.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/kujuxene.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a9b3c7b24---51109843135.pdfIn PDF document text
    • http://avistravel.ro/userfiles/file/17311226773.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_off0000c222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC222 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA34 18176 bytes
SHA-256: d4c136c643e16f58e1aa1d5f9356e2637801c55d1cbe34ac8d78f86142448ec1
font_02_sfnt_off000109e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E1 10644 bytes
SHA-256: 0ff234b5d9d1539683f7b95ce9f3a7a14bda68f62f746fa2710e20aef29bed33

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