Malicious PDF — malware analysis report

Static analysis result for SHA-256 375014af3185fc33…

MALICIOUS

PDF

71.8 KB Created: 2021-09-29 08:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 28a5b333199da569b01aea8cc16a3520 SHA-1: a2d9333b4b0cedb959afd907f53138643d0904a9 SHA-256: 375014af3185fc33cde4e2690348109089affb2a5ed2e9fd7a3fba3e0125eef4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://irlanc.ru/uplcv?utm_term=juegos+multijugador+para+android+online PDF link annotation
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614821827abd2---fifozubuxexosatirofuledox.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/zilajowarajifime.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/fesojemuxerubewigupobo.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/48ad3af846809926de1da2a3d45e4c3d/11052161084.pdfIn PDF document text
    • http://ucokampen.com/media/files/86283068883.pdfIn PDF document text
    • https://satyawatioverseas.com/userfiles/file/87848666448.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614316fd1184d---ribam.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/2660458583.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614809503a9b4---sigeva.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/84822508266.pdfIn PDF document text
    • https://forssah.co/userfiles/file/famukagit.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/84456875908.pdfIn PDF document text
    • https://people11people.com/uploads/File/93737972973.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/1331921517.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/28571755185.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/96126703502.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fc506e1c70---furijaxevemo.pdfIn PDF document text
    • http://www.bash.cl/media/file/70146205971.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/nonasadajazenepekamo.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/bepoxaxelulokutusuxe.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/479b09c5309af6ffcd3358961043004a/87999480675.pdfIn PDF document text
    • http://czminghe.com/upload/files/guwikitisorivogoxaro.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/legujurukegibuwibo.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_off0000b38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB38C 10956 bytes
SHA-256: 515552e3242bbb184e3fdbbba427f832ac3ddebf8343f3f9857e4118735fabd4
font_01_sfnt_off0000ccaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAA 17304 bytes
SHA-256: 2057838315bc0d2119893cd428b82c929c0edd82a7669739c73264c6f902710c
font_02_sfnt_off0000f950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF950 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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