Malicious PDF — malware analysis report

Static analysis result for SHA-256 d536a69e19e112d9…

MALICIOUS

PDF

83.9 KB Created: 2021-09-08 11:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 979419dc2d0a005f4ee3e424e17e7a2f SHA-1: 624e0790446c89943b11533c0d45794ea3ad5162 SHA-256: d536a69e19e112d9979b37339ceaec93034859ac119717575ec6e53b94dd7cb3
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 Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose, which is likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://crewmak.ru/uplcv?utm_term=powerpoint+presentation+design+pdf PDF link annotation
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/57b4352c5bd67fe5b77ddb34b8d933ee/58856392353.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/tokudojawumedag.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/54821439534.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/11101441482.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/18656433623.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/a9bbb445b09fa9e3f9272a526e6c3e0e/47198247904.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/vazosimejaxitolabizoz.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/bujewinaj.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/segisizezatoparozunuv.pdfIn PDF document text
    • http://ural-kip.ru/admin/ckfinder/userfiles/files/zoxivinetizigexizoxakun.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077da1953287---wenebivikusefov.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c993e04e979---modojitutut.pdfIn PDF document text
    • https://suprastoc.ro/userfiles/file/39052828753.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/zabave.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/44021883532.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/47446407484.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/72424808606.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609489a3879fc---99705942494.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/cfbe855c6230a9161d3ca104743e15e6/winukadezezirugosis.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/8d539fe7f24ea1f321bfbb593dee2c28/82092154551.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b807c9e8ea2---tesixirolatakoxed.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf163cb66c---rajaropa.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/mobobefakamu.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/24076711085.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/wadafola.pdfIn PDF document text
    • http://www.pvvc.cz/files/vijimasi.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_off0000e310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE310 10716 bytes
SHA-256: 86a246f1a7ace0abb1967333ce3f8e80e01c0ff6ee8c3f8f94ae55ee93d9c4c4
font_01_sfnt_off0000fba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA4 18160 bytes
SHA-256: 5a0566332bc472a36439b33279e9558b6e68884271e301d2c462f6168d4d11c4
font_02_sfnt_off000129df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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