Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d81d41fccb7946a…

MALICIOUS

PDF

92.9 KB Created: 2021-06-30 06:34:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8c39a2209b52075b9c5c330145619f3e SHA-1: f7d427846bc4d7704b2456f436b6cb32334b67ab SHA-256: 9d81d41fccb7946a9a9c907c06f33c1212a9f0f99e99512f596b986de8868cfb
176 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084af40b21c9---banupujeter.pdf In PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210623_7970B783F6F1E9DE.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/51791875383.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/87550166655.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6b442fbdb---8416606235.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/lonojit.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/0k419uc64onlpk7u8636um5l81/wezuwixujakefebexege.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/l65d8v2bltngf7bdc941dk34g1/tifadefapot.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/46229507426.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d07a25cad7---vemujufikatidewisajogurud.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/3189314132.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a06ef49755---puxonisezigegesug.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/b41b7d1bd1e96ddd3b010d0218e7fc07/pudazo.pdfIn PDF document text
    • https://xn--80afc2apd5n.xn--j1amh/upload/files/rososutadub.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607afbfb41b96---35180885037.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/soreforav.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/23cd949f288bd156e708c663ed28fd2f/fiwijelakazome.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb4b4aa8ca---36101682383.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/16079c783b3380---47053126194.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/jetebadakomijulilofi.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0c06b6f71---77273910815.pdfIn PDF document text
    • http://gibisch.org/files/files/zetumijokepon.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021061200070492.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/1136d642a22e308721dbdea5c170e82f/tazofijoxor.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/c36f5883f4f24b0b8794d2fdc81131f0/pupofotogejisasar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=conduct+interview+meaningPDF 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_off000108f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F0 17464 bytes
SHA-256: 54ccf6b057e816496a7cfec7371334a6f20dc4325c002fbacfd759c2f3e8d66a
font_01_sfnt_off000135b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B6 10780 bytes
SHA-256: 5b4b8a265a35a6682a61a801f982478d9967e3b8774e57166a4ec0a39fa4ee6a
font_02_sfnt_off00014e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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