Malicious PDF — malware analysis report

Static analysis result for SHA-256 14236e7a89b6500d…

MALICIOUS

PDF

85.7 KB Created: 2021-09-16 23:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b21e7fa2bf000d35e41b5d104466c4ae SHA-1: 421496599cf4554ff6fee05b2c7793bec0e0190d SHA-256: 14236e7a89b6500d3797985c862a3f28648c2a46765fa53f5da16a34c99fdbf2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to exploit users via malicious links, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pixomot.ru/uplcv?utm_term=werewolf+the+apocalypse+pdf PDF link annotation
    • http://www.bash.cl/media/file/lomafi.pdfIn PDF document text
    • https://titishop.co/upload/files/25157400397.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/fujijigubukor.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/5870909158.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/18929103341.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/sogunaleferivikuziv.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/66095326151.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/795414854.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/fuxizexoridiramupufo.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/99674885059.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac1f7a1a46---14139323400.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/joxanimuxugos.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/semowekobelonubekopel.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/13457b54b68d95eafd4b2187b0b54719/raduwasari.pdfIn PDF document text
    • https://medpressa.ru/files/file/17182874964.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/13086952424.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/63734209323.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/fosipewosevu.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/20d1d3d686ebd8d4e8d1b3974ef0c8b8/wajitevilekog.pdfIn PDF document text
    • https://intersat.lv/files/file/jefomegu.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/f3e2eee4ea77d104710b8dd7734eae1f/17142845957.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/nokuderenusomuluze.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/1673081940.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_off0000eb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10358 10712 bytes
SHA-256: 7481194de6e72143e435d7d00e6e1136840f8760011ffcc46e4a0bbdf3383ed5
font_02_sfnt_off00011c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C30 17356 bytes
SHA-256: 421682ead2cd377453f95098174d928a7425d8b2f88af50010a304452972ec7e