Malicious PDF — malware analysis report

Static analysis result for SHA-256 12d10e1379ca188a…

MALICIOUS

PDF

80.1 KB Created: 2021-09-02 14:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3e55b1b966f5f5d66775f6a3c16b24b7 SHA-1: b9c75cee1e082b14ae28fdf2e9ba214469580073 SHA-256: 12d10e1379ca188a94638e1ab847d79f23db7fd47e5d280ffe1a25ef0f696834
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable domains. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://gibisch.info/files/files/ninor.pdf In PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c52634f05e8---8040494498.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8298d4562---79394977059.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jagotipezu.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b04e176769---xajenon.pdfIn PDF document text
    • http://keigan-productions.com/clients/863431/File/bometowepakiruwupuvuvalil.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a7ad3b06c---97302622584.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/24907716444.pdfIn PDF document text
    • https://media-get.com/userfiles/files/38385297603.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/pe0fggn6djeted4ghso6lelpk1/53721822287.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/kitawogu.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cb9d759d5---zofatamowuburuzikuligo.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/28248848554.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d074a3df496---govukado.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/e055850417ef9c3ef71f8fd516acce1b/misefe.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/b7c6d2474ac0be9454902a2185806539/90336968010.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/gonatamegopebobuperusi.pdfIn PDF document text
    • http://hf1968.com/clients/48820/File/xazigesutaburibupejok.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/85101193445.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/89350424005.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/nirusixonomuganobijugul.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/forudutax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=software+to+create+fillable+pdf+formsPDF 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_off0000d5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D8 10980 bytes
SHA-256: 858de033f6bff9fc2735734c947d04e9fb485ba2be71fd4f808ede61fc8b278a
font_01_sfnt_off0000ef28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF28 16572 bytes
SHA-256: a5f9040d0a8dbabadf0ff70c0ab709bfbaaaac5e29053357e4f2d8227e16157a
font_02_sfnt_off00011a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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