Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5612db1fcc22305…

MALICIOUS

PDF

82.6 KB Created: 2021-08-31 12:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c55929e8dc4eab07effd315f4ae635fa SHA-1: 3ace99a3ab8d475c679631c591fe0c3a16fa26ad SHA-256: a5612db1fcc22305bb73d624ad6e2137723476e9b6cca3576561b676e2ca3c0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs that point to a variety of websites, many of which appear to be part of a link farm designed to redirect users. Several of these URLs are hosted on compromised WordPress sites or disposable domains, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • 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.
  • 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=adult+game+apk PDF link annotation
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/sasuxuvas.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/bunamaxumokazudovutix.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/60138984071.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16096b47db06c1---tuxujitupejigibagunawi.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/75318911905.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/vevuxasigawonediv.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/57988952493.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/80976472044.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/aab4a55fcf42d96e659fe7f0e806329e/zuwokagakikepugademu.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/64645634580.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e21fff8b6ab---dubilezirakobosuvu.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/jevupodafodop.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16102c63e3ddb3---19536724593.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/76564114992.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/wosifosufogofuxizeg.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16116ab8590e17---pizirurikutojud.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/4914860524.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160720330a58a5---50741256448.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents//files/65016118953.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/44445de238f884fc2606275b8ad6e9b3/sebasis.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/96351471617.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160704a94f3cc4---wagisodipimafojaviraz.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/sikadulebas.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/vigogoxufug.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_off0000e0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B0 17216 bytes
SHA-256: 93cdb934a5d73f52d2fbe2a9f9a2a6f421bcb5bd1546156047e1adf17a8e5712
font_01_sfnt_off00010d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12555 10324 bytes
SHA-256: 7ad8c567405b0a11dc270facb6873372bf7ba1477440d012f5f5e70bec6ec3f4

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