Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ea66215de5cc4e0…

MALICIOUS

PDF

92.4 KB Created: 2021-09-03 00:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a2b1f7d266f2038eabea46a1b2883b04 SHA-1: ce81c2f01966ac039d1de8c3f397c7ab5c5057d5 SHA-256: 3ea66215de5cc4e00b3bdbc2535888657cadc346137df908320966b421efe2f9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The file also features a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://zaun-produzent.de/userfiles/file/27346441070.pdf In PDF document text
    • http://purofirstli.net/userfiles/file/87306785899.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/rujetitodo.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/hbv9led8e59s6hd7g70tt77533/zomawenazazok.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/jiponixidajuxururikip.pdfIn PDF document text
    • https://blugarden.eu/file/susetabiwavukazuju.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160839ee251e31---dozuzaxubumobirofixepexob.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/84064407980.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16096caaaf3223---28228158280.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/87569962708.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc7e54ec119---nomubebunimosomupojabikug.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/mhdt1qi3v6vhtupkaepaddvm02/82420585599.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-12/20210512115145117797.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160782a5ab0896---81578775814.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/51168308650.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/8eapjd5eocv3u04nrgjfidiga3/lilurawonudexufenejira.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/93053396576.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/160967bb76ccc7---zimimewuf.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/73977877447.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/38940470690.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/gogufuderepitimezeditim.pdfIn PDF document text
    • http://hzqzg.com/d/files/xoxejumitunexeneval.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/11117856897.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/55095104014.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/63841882113.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/pigawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=family+law+act+2018+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_off0001037e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037E 10836 bytes
SHA-256: 086c4d3bbd434184b5d5afeb0eca22e3ac2df38bb5de6ea6c4e92b6dcb188aba
font_01_sfnt_off00011cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB0 18340 bytes
SHA-256: 8b0256c718a8dc514fc7b28b447a87236a92a7e8a7f3a35587447f8e0fa165a7
font_02_sfnt_off00014b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1