Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6c8d25e63291605…

MALICIOUS

PDF

118.7 KB Created: 2021-07-08 04:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0d2b18e5efc746a04c8a2f1ddd684538 SHA-1: 4a94f1e0879a16dd8e8107ee8727d74067530229 SHA-256: e6c8d25e632916058f022a0f01416cd20a82e25d455237f396aced4daafc8740
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded JavaScript likely facilitates the redirection or exploitation, while the link farm structure suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/c6fa373f0ddf9500bc35185cf3e8d195/8387569821.pdf In PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/7905a2804fd556583f288c3beedc622f/midowawarogalokisufukal.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8d9f58497---fapitoguwuvumilinarimexug.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/turesidas.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210504193830083109wg36l9.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/ec9g3bhkpop6m391jvt4jt66id/zewadipuwuw.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/walixelivim.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/durijinazezagupazafuxop.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/irvikt2p4ibf20s24b9fv797cv/xobat.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf5e6c38ad---19813781911.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160792647d6d88---nedisibujekizagotulizi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08509aedb6---fudejidifesubesedunor.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/761962c86d5382246a2ce3a3f645cb2e/57816532681.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/91eec47baa73601dc1fbff022a1987e4/sizaraw.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb1b100efd---kusuvevun.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606d66ac62a35---42536620028.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ddb127121---kazakorixevufub.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/dcj89mdm99qddj8a6jgbsurlt7/zodewajopasoganirevo.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c70bb50e13a---13862153681.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/gepuna.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83d9a5f475---3314135195.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/jigaxalimeri.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/be639id0vtlm0v4tcfgpg6a6hb/vibitonoxekokef.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/danamise.pdfIn PDF document text
    • https://asiajitutop.com/contents//files/6761844996.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=low+turbidity+waterPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000183c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183C3 10320 bytes
SHA-256: 315065dcdd7901b93c8539392ccb05435c75e8e445034ca82a6ae8782a2f3ea0
font_02_sfnt_off00019b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B37 19604 bytes
SHA-256: ccace0063b3666587a5d755ccbc94ae01c3bd4f3bf7c3d99bde6d079316c506e

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