Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e2cb6c326f07a8…

MALICIOUS

PDF

69.6 KB Created: 2021-07-08 08:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4fccdfd65aea452c760b1b6eff2bc3c0 SHA-1: 9d05e5454f82a4e15023a8a5c8ecda4804c2dc03 SHA-256: 31e2cb6c326f07a89402b5383de0692eb246da324005d05c839aa2233ca783d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which appear to be compromised CMS installations used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the link farm structure suggest this PDF is designed to lure users into clicking links that likely lead to further malicious content or exploits.

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://circolonauticofavignana.it/userfiles/files/24062228450.pdf In PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/mutidumidit.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074baae354eb---lidireguxaxiw.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/2af7dc0439be5685c1eab06b468e42d6/tarefovinurumosal.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075d0291e727---87153904353.pdfIn PDF document text
    • http://wajl.net/img/file/202161815455.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d0360e2d3be---genizaxunorovijewugemale.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/89f39302c933b8bcc4e784374f034c89/59405851519.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/womopotulijarisopuxa.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/b9115c21ae9279990154823c73ca9cc8/59148982014.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3e70297b4---4911440629.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/35467156703.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/subegixubibobodos.pdfIn PDF document text
    • https://synersys.fr/contenu/file/44130491206.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/ksr13retsd21fskgecs88032hu/61446728194.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/d9992434ee6e8738c6a12f9739a92a6b/pemupavavopokijar.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/nomiv.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/najalinemuzosajuwof.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/2e05594f7268b6b12e02990c53743f9c/rovudiz.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/91854953291.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/f69c7cdf4de33fedc044da7b423b32bb/faregerepas.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/a1a3e1660e47bb9e67e418957fa2ba3c/fakitoz.pdfIn PDF document text
    • http://samtekelektrik.com/files/45155213499.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/961e1ec49578af667481ed95d7ee9fce/94281828409.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=positive+measles+titerPDF 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_off0000b40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB40B 10232 bytes
SHA-256: f90b6aff7a7bbd2a7ff8ff573f5d46c0f4aac544eade4f9d1ce6bb5b7a6c7789
font_01_sfnt_off0000cb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32F 14956 bytes
SHA-256: adc48add956050c1349adc795445accacc775f862f5ef771ddd42ff10aa32a3b