Malicious PDF — malware analysis report

Static analysis result for SHA-256 de64921995d39a7d…

MALICIOUS

PDF

72.6 KB Created: 2021-06-14 14:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 73ff111bcfcaf2bad70e6597c1035b0b SHA-1: 7039988e0cd01ef5e19f2fd657b59b1c24918772 SHA-256: de64921995d39a7d5c4e0a55c45a4d8be3a3c0590bf1c0273ffb701725936d0c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute malicious content. The document body, though heavily obfuscated, appears to be a lure for downloading word search puzzle books, which is a common tactic for disguising malicious downloads. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://archism.ru/uplcv?utm_term=libros+de+sopas+de+letras+para+descargar PDF link annotation
    • http://alexlunacoach.com/img/editor/file/76432768339.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/057630662320c53678bca71e1d82862d/3325945064.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/8ca1edeb8877a4be253d583c96252a99/26680154796.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/44696273276.pdfIn PDF document text
    • https://jobtiara.com/files/files/nizidi.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/1fbfb7b43c5f6e492745f7efb20389b3/53043966057.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/94066961737.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile/%5C/2021050423102431.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd8d557952---waxifitijukenu.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/zurozixores.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160823235a9ba9---rolobexi.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/kobenujigewitovaxoniz.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b35e79616.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/begizilem.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0812b0628---64326539391.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c6738747856a2993d9d2d2caa0b1bad1/xakelilajasisimawazovi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F6 5320 bytes
SHA-256: 1e8f34333e82e793a0226abba02632e292f12942ebbcd0e83845fcc32dbbb1b2
font_01_sfnt_off0000ec12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC12 12136 bytes
SHA-256: 6e5de1de8a1bc9c0a4fde81c3de197cb0785defc2408b2061df9b4d94dd7babc

Open this report in the interactive analyzer, or submit your own file for analysis.