Malicious PDF — malware analysis report

Static analysis result for SHA-256 775864a89431102b…

MALICIOUS

PDF

84.0 KB Created: 2021-09-06 19:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8fdaa07cd8c630ceb331b3e9fec67922 SHA-1: cee21431010e235197c47e30d1ddfe216bdb9fd1 SHA-256: 775864a89431102b65102a53c9d9e8ac5835d49e34179ebb06f89d806b669fc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content or phishing pages. The file's structure and the presence of external URIs indicate it's likely part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://oniceh.ru/uplcv?utm_term=atelier+de+roxane+livre+pdf PDF link annotation
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16077d098223c8---bavetiba.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/7481938b05d2201a6cdf0297a69af473/zefibobu.pdfIn PDF document text
    • http://clinicoral.com/img/userfiles/files/547144807.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737c96e76e3---wizawomuwireguxadozafova.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/98585218936.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/fcce8a36142f40bb6407fe9b9c3c7b7f/24858120084.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/pojade.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/95289654527.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/73837980071.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/58268786661.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/94064407549.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/5120263578.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/760b69d3960bf4b83f03a1cc1979ddf2/wufijasan.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/68a44667ea7d32ad452726c78627ab77/pesotebopudosipagakez.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e167de0206---8683344358.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f031b3e48---66914326394.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/d8596600594b09b059708b95a0b22515/sisimiwokode.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/demaboxesazawijixajolarum.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8f46f689a879469ee53b2731da9327ed/64132187412.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/tidepogugib.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/sivaxafexune.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/67852628854.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/fezuvemob.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/eo8m6ql3u0ba4hamgfvrkjjudj/29260002398.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/jigenezoba.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/1cd03ef31d62d9bd23e898fb604fc2be/kuvusuti.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_off0000df58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76A 20636 bytes
SHA-256: f87e8dc04fb1e973e0dc3ea2fdb5c09f0cba011ad0f116c99d1a4c22fe1565a7
font_02_sfnt_off00012a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A27 10472 bytes
SHA-256: 88e232acc1bab44202f187155b7d8411240b05821aebab39bc69dbb67403a29c