Malicious PDF — malware analysis report

Static analysis result for SHA-256 57790fe0eb2a5d8a…

MALICIOUS

PDF

69.4 KB Created: 2021-09-25 19:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 25ffac5fc707d69e875b10650d054401 SHA-1: 2961463700b9589b725b76611df13f8b9500497c SHA-256: 57790fe0eb2a5d8a1f3bd4466d16a94473b49893b6535906f17ae0f46340cd7d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features numerous external URIs, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious sites. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=can+i+cast+to+firestick+without+wifi PDF link annotation
    • http://colafranceschi.it/userfiles/files/vedopesivafi.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/81775098525.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/mirazanaramofatogirobor.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/tivikopabevexejetojowa.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/4549551417.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/jarubasetelagob.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/62049269794.pdfIn PDF document text
    • https://birotex.rs/images/files/36247971515.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/28101714739.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/buremojokofemetinono.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161307419bdc93---pewefizaresovesiraxopisor.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a0a6b1fcb---73429634674.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/jozezirexajozewimafuzexun.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/gisokumo.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/fanugolilakutuwuzeweput.pdfIn PDF document text
    • http://hzyixiangchem.com/upload/files/81594790378.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/fk44uajb10ckodd2kqaj16kdn4/zosebage.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139434b60345---badadetemirupadutaxemakun.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/43186200968.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/83947651152.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/2046242747.pdfIn PDF document text
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/77232804121.pdfIn PDF document text
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/powanakupogoboxomabaxemi.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_off0000b1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EE 14760 bytes
SHA-256: e44e5b84f1d6b2ee2169345716691ee202268b058c594249bd78f80139afb723
font_01_sfnt_off0000d6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DD 10696 bytes
SHA-256: 6ee482856207844ff4ca0321dab7d63725feb98ecc3f3124c9511d29d5480300
font_02_sfnt_off0000ef81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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