Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a6ed4d2bd7f02b3…

MALICIOUS

PDF

78.3 KB Created: 2021-09-17 04:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4ba466a12f32047c41599a014ef5bba6 SHA-1: 5d007b34a76b0145429063de3529c1c2f4e5bdff SHA-256: 1a6ed4d2bd7f02b365103f1c4ed00a696aea00c0132f6af16218523095e75a67
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to direct traffic, potentially for SEO manipulation or to host further malicious content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=mod+apk+apps+for+android PDF link annotation
    • http://odumakus.com/uploads/files/dewepaxiko.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/89079741888.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/ca899ae188400fcc3239e25800d969cb/79900399971.pdfIn PDF document text
    • http://harlit.com/upfiles/file/tudadaxupoxevaviferola.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/rodenazexebubelegotarumo.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/62695359552.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/lorizugo.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/76136977212.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/vamozowesafabemuveliv.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/niminemaxuno.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/fodosujolivir.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/33136153800.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210917000551.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/16929172897.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/52961328036.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b24f2e1bfe---49041816369.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/6680424000.pdfIn PDF document text
    • https://kaimano.it/file/roropovuxazotajokulu.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/fuleloro.pdfIn PDF document text
    • http://fpole.ru/sadm_files/22650627322.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/gajoguludofeze.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/0b53a02476be535c9e1b06a3b02e4388/fesapakifogodoxufukov.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/bakibokavugipagi.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/ca0f1706bd48793af098b72515fa85a3/dufetiboxoxexekajidoxov.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/40685272552.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_off0000cc6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6A 10300 bytes
SHA-256: c752bb5da3e4719a18f2a18f0ba2d48cb9c6dfe698a47697fb7c952ebbbe8d6a
font_01_sfnt_off0000e3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC2 18208 bytes
SHA-256: 3b585414885576260794198128eea60d271eb226a2769d897f1cbebe36550fa6