Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f225f14f817f8a…

MALICIOUS

PDF

84.1 KB Created: 2021-09-12 22:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 33623783cad6f046548cfea94e25f603 SHA-1: d81696ed47a8691be3881b28ff214d1e6346902b SHA-256: a3f225f14f817f8adc80d5f241772efac2c0d1b875b0f274688aba841ee057ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://avandcie-energy.fr/ckfinder/userfiles/files/84019392610.pdf In PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/86641649349.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/vabirubunofutitus.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/lakogagirirosanap.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/tejiborofoxoxabaxosuj.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/8053525922.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/muwanifuwub.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/xupukovekix.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/jufapamogodasu.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/4540816515.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/17796384144.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/62940099695.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/gamurigobowomotoki.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/23481463731.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/fabudopowevigiweteb.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/4597525176.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/a64b075dd12c45c8965b1d073a2fd013/61619092141.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/wamopenonemeko.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/9026038328.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/robijiwumexugelib.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/gunisudajuged.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cba2d189c3---duruduj.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf0b22e9a2---vaguwigevipow.pdfIn PDF document text
    • https://majubesar.org/contents/files/62797026620.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=words+that+start+with+the+letter+o+to+describe+someonePDF link annotation
    • https://easyown.ddproperty.com/datas/files/70335858414.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_off0000e19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B1 18384 bytes
SHA-256: afcfee057f49c154716e4a47f700e6dad0d0e88aabbf8624312d9318231ff0b1
font_02_sfnt_off0001297e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297E 10856 bytes
SHA-256: 2e70b1216318d3515df3ea8a63259f20c5a227d43110dd8459cb89293b276310