Malicious PDF — malware analysis report

Static analysis result for SHA-256 607d3ba7a9886783…

MALICIOUS

PDF

76.9 KB Created: 2021-09-19 11:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 12c24cefc65f74af21fc96de46bc32be SHA-1: a05ceb62af66f5c954e089d184849bd9d5347a16 SHA-256: 607d3ba7a9886783e4e8b3edb16b5bff82770b6cbd359333126b2b2aca8f9daf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics further supports the attack pattern of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://inwebjor.ru/uplcv?utm_term=kotor+save+game+editor+android PDF link annotation
    • http://smelawservice.com/file_media/file_image/file/63102176752.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/nopagafajekijilukajepexi.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/68466919668.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/61504901660.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-12/20210912145412803164.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/sekotemuwu.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/zuvebaduvataruwuv.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/najowoterupejozu.pdfIn PDF document text
    • http://com123.vn/uploads/file/lofumebulupo.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0b94313b8---zogigejevofu.pdfIn PDF document text
    • https://stauber.lt/images/files/dadakimugevim.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/23930855984.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/gokalutixu.pdfIn PDF document text
    • https://binhvi.com/upload/files/74133141414.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/3026333155.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/161442f177dd4d---nevin.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebf681f51a---75437642632.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/74762441350.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/gimej.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/161443268dc63d---15188951057.pdfIn PDF document text
    • https://digiconelectronics.com/media/tedinevofitunaso.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/gerejiw.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133019d344be---liruxosuburo.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/1937b29f4d33a09e3a058744b30d6168/koturujumuritu.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/wodezaxapadezagar.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_off0000c86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE085 10600 bytes
SHA-256: 7dba4b2f51ef610f0ca66a87090ccd7ff296351fccf629c37ef83de390bc4960
font_02_sfnt_off0000f88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88E 17392 bytes
SHA-256: c13b584710f14a40c8c3b8c445d3105aac0a25c53676e6ac5a288158ea8b637d

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