Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb3d626f7656c799…

MALICIOUS

PDF

79.3 KB Created: 2021-09-09 14:25:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 46059e2d90a23a237d3ef9ec55b7c514 SHA-1: 841fddfa28509edcc2cc4e59708276f01a992bb1 SHA-256: eb3d626f7656c799b6e0c13a91051a41d7a9dac62bd1da164c56f932d48eff79
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. Heuristics suggest a phishing or malware distribution intent, further supported by ClamAV detection as 'Pdf.Phishing.Trojan'. The document body is heavily obfuscated and unreadable, providing no direct textual clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=awakening+horror+game PDF link annotation
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/movinaxaxozir.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/xugirekegixoz.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/16161426176.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/referuvewilir.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/67031386707.pdfIn PDF document text
    • http://espicycooking.com/files/file///mowoxosafowita.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/vubutadusul.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/161369d0406b72---78652179001.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/rapamin.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/vazibafilomazote.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/1278042757.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/57329894814.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/161315eaf15de0---badomiramu.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/valubej.pdfIn PDF document text
    • https://coevent.ru/upload/files/jaxebubokefejopirome.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/76250190300.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/55059930018.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/bovagifudurolanoniz.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/43416353079.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/99995449528.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/zisipuwugi.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6ab0e899f---nunozurofejum.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/c8757fab862791ee70d25431995f9ecd/molij.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/dopexikijuxerirusawe.pdfIn PDF document text
    • http://kasargod.net/uploads/file/58168484302.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/lirezimegiziwinob.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_off0000d44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC60 16988 bytes
SHA-256: 9b675298966cec2bcb371e71292b44fcb293139282dd78e3810debf9dff2c1dd
font_02_sfnt_off0001180a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180A 10404 bytes
SHA-256: aa16c0850a4346a44ea3163ad0148d574b01a33372915ee6e72ef5481b6b40a7