Malicious PDF — malware analysis report

Static analysis result for SHA-256 502e2e7e80f271fc…

MALICIOUS

PDF

96.2 KB Created: 2021-08-08 02:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d13797fe57ebe6021b60802d70529d65 SHA-1: b93fb0c50ca1e087e964f1eb1a7297a8fcff4e32 SHA-256: 502e2e7e80f271fc65c903601f463d54e54abac43b5c0f1ebe03cc50045b7acc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, several of which appear to be compromised WordPress uploads, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/rigeguxatuvusudu.pdf In PDF document text
    • http://xboxheerlen.nl/userfiles/file/bodanuwadetiloforolowi.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160897d478fdea---xolofuw.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/47541220876.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085e31ebd267---72272829251.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/43068464632.pdfIn PDF document text
    • http://gyobel.itpublic/file/1372533569.pdfIn PDF document text
    • https://windsbs.biz/files/file/59259252375.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210613101834_ewxngj.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/tuwubasufurimukarebezit.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/87afbf2107341fd18a1c822edb50e8f5/doxasasodibabifexafufak.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/gulidume.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/54402289971.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160aa15b9eefb7---18204506396.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/wedev.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee9a496e9d---pigub.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16087d087e6700---polakoxoxesuxexeboja.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/joxubobinevituduta.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/38e94cc8363d486ed8ad31ae632d406f/89485375102.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/77uj1ppabveolcl523sv338udi/xamilapuwelosinezusaj.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac50b23dabf---labuvozosofewalin.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/65278389822.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/44282217660.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/12594836935.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=400+dpi+to+800+dpi+converterPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10473 18580 bytes
SHA-256: 9422fac8f82475439922d5b375b161472ff58874af16b82aaf30f8120f553b45
font_01_sfnt_off000135d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D6 10508 bytes
SHA-256: c15556b1ff3baed5eb6c909b3c20c8ece3593a7109ea4c220cf6c64d413cb00e
font_02_sfnt_off00014ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000165ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165EC 2932 bytes
SHA-256: 99bc7f88fb08af18862dfc4e10c4823a7691e9097c0c9e8f48b683a182380a4c

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