Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3191dadf9781c22…

MALICIOUS

PDF

90.2 KB Created: 2021-08-03 05:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1ec6906802d50eae09e1b6d215c4ccd5 SHA-1: f9ea57aa3b248b94e6b33d4bca94821013d9bc5c SHA-256: c3191dadf9781c22e24679b531af0de112c12d2aa5c8bf945b8df71bc9780b0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and other domains. The document body is heavily obfuscated, but the presence of multiple external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 http://agnieszkapawlik.com/userfiles/file/79279281165.pdf In PDF document text
    • https://hanyauntuktesting.com/contents//files/38189473641.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/5mtuvdej3rj2jou94koob2nvs4/roridotuwujini.pdfIn PDF document text
    • https://go2germany.ru/files/file/rekibaj.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/bodoman.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1053874336609472685bf0a.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16080789b89c1c---jafuro.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/6b2279f3bea01c8a18101df2db4c5a2e/54489253125.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b202ead558---kanalikugujegofosu.pdfIn PDF document text
    • http://parquessolaresdenavarra.com/userfiles/files/lasikeji.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/0a39feea918e88a1ec7304e9482ad94f/49469003009.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82aff5ef55---94460565565.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094761e08125---73850310642.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ca5200392---63837832222.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c26edda704---kitowagal.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160befa49c9004---fediwalixotajoko.pdfIn PDF document text
    • https://service-panev.com/userfiles/47176262468.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/88552889354.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/vexonekigosidenifafize.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/93746575885.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/698bd45e91a0d15a81c483f80e50dc52/talogebafovubitivawoben.pdfIn PDF document text
    • https://computerzone.pk/file/bidabisir.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088a25797567---6768139574.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bc2302d24---58698816726.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a94ee3c7189---kekowani.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/b57a7f18cf89ffd38a69ad5039ea9ace/95608843798.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=libro+formacion+y+orientacion+laboral+tulibrodefp+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_off0000f367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF367 10924 bytes
SHA-256: d6cbb537f752e3dfd5c2780c6d4303e4dcb3032f71e959abaca17d6caa828fc9
font_01_sfnt_off00010c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12497 19656 bytes
SHA-256: 52ebc6950f0a3c3f3316f50e0b3d1ccd1015e1ad3d5fd9419391c1b664c6b83b

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