Malicious PDF — malware analysis report

Static analysis result for SHA-256 710215a877f043cb…

MALICIOUS

PDF

84.2 KB Created: 2021-09-01 20:42:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3bf01c7fc944e9bdd232176e7235941f SHA-1: ef828207226b12d877118e722c335302543b46a5 SHA-256: 710215a877f043cbf8a0349a40e3171300eb7c862866f56e22f88b6abfff681b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://garglob.ru/uplcv?utm_term=sociology+and+linguistics PDF link annotation
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/4c469dca0d698366ba39d732a6a55a05/namovupux.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/0817850b7d6d8ab763f5ca0d7b4de685/52747512586.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/vnkuq0bh5bl8qjqmelbhicmqb3/xipoxadusoj.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927fc53bac2---46857994914.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/011706093510.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/xebiranilesefuduwejaze.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/21148047038.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/d959226188a2997b5cf8b1e1f94a1017/44288612492.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/37737992263.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/27561720151.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096aa6ad9bcc---suxexemuwurudumo.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/fonebivavukimuzufulipegup.pdfIn PDF document text
    • http://beiks.info/public/file/limij.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/mowitaranafexigaroma.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/kunikifoz.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/63041422338.pdfIn PDF document text
    • https://drvishweshwari.in/userfiles/file/peviripuxok.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/75450684643.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccc0433190---50382845137.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210901_00531A6CFC0F0283.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/54865169189.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/xiwobijaga.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/ganiruwe.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_off0000e668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE668 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7F 10600 bytes
SHA-256: 8179f9e4a3acea970fcba6415fb0b21870a00aaf835cfc8ccbabb4338b78af38
font_02_sfnt_off000116a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A0 16972 bytes
SHA-256: 5c5c4ff5d2d082f6c305bfc5b947f35872180237006613553ea1ba7a433ad382

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