Malicious PDF — malware analysis report

Static analysis result for SHA-256 717032c9cb6cf0e7…

MALICIOUS

PDF

73.9 KB Created: 2021-08-28 06:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 092038eaf1019d2c862002fa4ddfa72d SHA-1: be026c163ae3264d9fb980f903d259e0d5299f7b SHA-256: 717032c9cb6cf0e76cdb1cde8c6057979e3102b31ef1bfdb33ce39ae0e5a5464
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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 https://allytemp.ru/uplcv?utm_term=management+concept+and+organisational+behaviour+notes+for+mba+in+english PDF link annotation
    • https://kmkmekanik.com/upload/ckfinder/files/menadulunav.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/p6dpooji4hd53fegc0l2a280s9/fokal.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a0ade98f3---zaruvubo.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/aa3697c4640eea85060667d5475f7329/93157479911.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160cc2e320b4cc---36640497417.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/51388241130.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/64142119690.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/2c854037f4dc7564d54897656a99cb4d/24449394795.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/57992497688.pdfIn PDF document text
    • https://efnnma.org/files/file/87466362932.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c578ee07f0d---14564083707.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/lufarexitaxadopuvifefefu.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/1365671169.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5e2549511---pulobi.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/56308475495.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/sugukap.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/41902788774.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/a6339c28f674f49fbf0edcf66cf9db73/16046878622.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/1568947290.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/16109316f4eacfb7da6c4742bb306e53/8599739980.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/26949470906.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a697451d4ce---vowakil.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/nilapoliki.pdfIn PDF document text
    • http://medrea.ru/upload/files/gajivis.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/7csl35drcr6vq5iuvq9bqo0gn7/83090713204.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_off0000bca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA6 16696 bytes
SHA-256: a01dd9098e612ff80bfd9f4ae1cddad67e390f4a6dc76e1ca057c641db24329e
font_01_sfnt_off0000e6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EC 11368 bytes
SHA-256: 21e50e1844da302b081b81bd849c8f430a21f9d1f472790fac5c4e1bb03883a4
font_02_sfnt_off00010112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10112 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1