Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe38596d70c17e8e…

MALICIOUS

PDF

77.8 KB Created: 2021-09-07 21:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3592d85caa17b398ffd089d2c076d1b5 SHA-1: ed90a0b3e6bc6b9d3a493f079dc9d9b95d12c72f SHA-256: fe38596d70c17e8e3d684c7f307a384e2a9ebb1cda45dd4013a02f79cf61e34d
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URIs suggests an attempt to manipulate search engine results or distribute malicious content. No scripts were extracted, but the structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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://seghers.kr/data/editor/file/981105781612f2fcce2dc4.pdf In PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607650512b7a1---rojegikavusofovuwi.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/i0otv6a8kto70ts3dn5m8kedr5/66078454134.pdfIn PDF document text
    • https://cuatudongbinhduong.net/uploads/files/palaxebaluranajanu.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/gezivofamuzelipanarotel.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0074787001625285968.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57386624928.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jubezufivoxikanibom.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/nopajodo.pdfIn PDF document text
    • http://goreskyreunion.com/clients/b/ba/ba087d28c24afe6c5bc45fa062332e47/File/finaw.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/41098018213.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bad23b459---daxawasa.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/kagijixijedonewenevav.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/mavinowalosaxuvizi.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a9dd7223c9---78529177718.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb3e5f27e1---87331800626.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608168407d9f4---64428287837.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d927d4452c3---patiri.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/witarufedagotewirim.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/mkvcbvoc92em6nl1jdoaauba9r/65986214096.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/linebapixukonogoxuxetexo.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/46672474413.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/vopowusinomedenevuselul.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/25575016988.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/19239005461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=anthropology+telugu+books+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_off0000c960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC960 10948 bytes
SHA-256: 505f71b645b59eb4fa87f159499da277a218149d75b7fa297522fcde96f7906b
font_01_sfnt_off0000e256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE256 18024 bytes
SHA-256: 7dc1134a8fce926f6212584023a01f7a3d0d84deb71ddb8af918b46e5df91b01
font_02_sfnt_off0001113a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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