Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e9156aba6c041bf…

MALICIOUS

PDF

74.8 KB Created: 2021-09-04 14:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5a758920eef2cfbdba02166ea3cfa9e7 SHA-1: 873d6a49a8d7c82a6ec1c98ade25fbf5e1d93acd SHA-256: 7e9156aba6c041bf2b44a52b9f730f8d36d1ea632073986b9199af479fcc2f6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure suggests it functions as a link farm, potentially leading to malicious content or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=plantas+c3+definicion+pdf PDF link annotation
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816821b0ad5---5053286587.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/wobizurimururim.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/zeviwugakazagolafojonipud.pdfIn PDF document text
    • http://gerocuki.hu/user/file/godorapureja.pdfIn PDF document text
    • https://amgaa.org/temp//files/nisafimosigenavifita.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/67c87a88455945ca96bf0eb9c67d8b9e/xifonozawe.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/ea61f7f0667f69a10e5f0216057a8e97/rapisetegosunixewelajajot.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fubebidovi.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///55815200189.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/gjs7ll657jb42goeivlek063t6/geradumanuwabujonijumow.pdfIn PDF document text
    • https://ms01bet.net/contents//files/51011874381.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/a3d83cabd2881b8dd08e0a408447b21b/49218864817.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/46988251928.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/73184787073.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a9eace6d6---wofuvu.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/42058389114.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/92828780315.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790f558afbc---nibujatekelovajigapexaxo.pdfIn PDF document text
    • https://egf.tw/test2/images/file/46528365628.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/18109517316.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160fcf0e55065e---28287218072.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/94604911123.pdfIn PDF document text
    • http://usmleworkout.com/files/file/gofixapidawepobo.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15f1437ca2---polujigifanenuxav.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/naxuxatebutonuv.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609db0dfdfea1---pumeridus.pdfIn PDF document text
    • 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_off0000c1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F6 10688 bytes
SHA-256: 6d96785884f6ceaa0a42d9103f93fa463c495a1bfa0752ab145484f8c69d7125
font_02_sfnt_off0000f29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29F 16844 bytes
SHA-256: bc2b5d48d4b9bbba6384d2d2c80cae03aaf134c30af9b7d606b0ff1a32190002

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