Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a60c197de1ec2ca…

MALICIOUS

PDF

93.0 KB Created: 2021-08-05 14:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 463571be636a150cc6291b9b43f2e111 SHA-1: 1c5517ea83bc0c07d9c962de8de98d78f5933f2c SHA-256: 6a60c197de1ec2cae4808da65a5aba863c614e45bfa85d99697b17d6baca0957
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also features a large number of external links, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://krisoc.ru/uplcv?utm_term=cachorros+french+poodle+en+adopcion+en+guadalajara PDF link annotation
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/tf8act692dh2r83agfh23dio15/rebosid.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/57626947509.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/rupamowulegilaxorer.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c087c015535---gifimadib.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/2892450018.pdfIn PDF document text
    • http://kururlaub-ungarn.de/bilder/files/17184045989.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2e7527f26---29851064024.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a00116c35e3---79052043240.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/228a618a0254d187d2e0723523faf2f3/17689587234.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16072f1c55bb98---93361468956.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/sobuku.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9134bee4c---27401857004.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/bomalijezewuvupow.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700f9ba8167---52380787985.pdfIn PDF document text
    • https://avenue102.com/uploads/file/vibijadobamasawefomevona.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/57383485609.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/deadae1c09dc28615d3a3cf81c3d7bba/laxamirogupizovujafugiw.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4a02713aa---gagetibolibijamufa.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/gizutenusoresiwaduteje.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/1d78d9255bdce24225f1681a88a0b7ba/warusibijifolazibudi.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609efa40950ca---dajafawuxegoxonezopumi.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/0uvtdj3je8ui7pdflh5krv5llg/53741721908.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/55114865863.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b080d9d3812---80436480219.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_off0001047a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047A 18604 bytes
SHA-256: 79dd769f539401a9912019779607a99f379e2346bfb496453b74154283b461a9
font_01_sfnt_off0001333c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1333C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B53 11060 bytes
SHA-256: 127d98ec4cecdeb8103b8ddc60b184ca6f0f0e4bc00877b90042de7a6373eb8a

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