Malicious PDF — malware analysis report

Static analysis result for SHA-256 43d7889b53390ce5…

MALICIOUS

PDF

72.5 KB Created: 2021-09-05 16:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 57a3378a71fccd664aa24b313364bda6 SHA-1: 122129856a80edb8df356a39dcb25d502d69368c SHA-256: 43d7889b53390ce5998158ba3bffeaf2cc89c28dfd2f4174c0c463e212a61464
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm. Notably, some links point to compromised CMS upload storage, suggesting an attempt to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 http://growlink.biz/userfiles/file/84520334871.pdf In PDF document text
    • http://hyperasp.net/userfiles/file/8467324046.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/vofumiriledotujujarid.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/7559302962.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/fowozuwamub.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/1819861097.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/dapawiz.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/2kt112jvd2lij54ah2gfck8rm5/wikosotisekuzuzipe.pdfIn PDF document text
    • https://unosms.us/userfiles/file/32538620228.pdfIn PDF document text
    • https://talleresimad.com/images/subidas/files/wadebixadizozadagirinesap.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/97770790864.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/40a2e6ad99082d85e72339ea56d2c112/72461916746.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc21e00d60---65423154041.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/2943bu5t6hihpvamnrhv35bra7/jipefumu.pdfIn PDF document text
    • https://alexspa.pl/userfiles/file/fekinufoxow.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/62480252068.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/ttv2q85s17bbiuim8lfdo4pj9n/47208686629.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/a36c26ea93d7db07b320263675a55de3/vilarazo.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/f1a0b2996d3c503d89c037127d01373c/mujunozu.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/4607d24d167bf3e115f76a5b914b807d/1917327477.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/25822d5bba10fb7ede038f9e7bd9d2cb/munapixuviw.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/7b592b20173ec155d7a5ba67a2760ec7/23377735313.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6b1b44a7a3108e533739c33952a6d00f/15693467500.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/kopesamukogubem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=furuno+navtex+nx+500+manualPDF link annotation
    • 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_off0000b3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FD 10512 bytes
SHA-256: a874a6012b5972165081ff28c6dec39f33d3bb08ceca33eb80e5c89e48dae1ed
font_01_sfnt_off0000cbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF9 18796 bytes
SHA-256: 65a2bb2410bca74b5e742a84d4449f91b30a4e10b13c702dc67f88725ccaae24
font_02_sfnt_off0000faac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1