Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd539829da0d1dc…

MALICIOUS

PDF

73.4 KB Created: 2021-09-03 17:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 56bb91d508378c6d2e69d45337d4ed0f SHA-1: ddc47b2ba66ed9a4505359975c136eaba383db5c SHA-256: cfd539829da0d1dcdb08017975b7568003cea4d47f5e318d99c4dacf3d3f7080
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting and the use of compromised CMS upload storage are key indicators of this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7c4d75544---81140411454.pdf In PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/poberaxexomifo.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/02a256dd4e211c12ca2b1c404c23284a/57324421355.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c908220221fab2c6f37bd9fcac04c9f8/69155007169.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/sadinatexojutakurezam.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/95413456852.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021521129354070.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/c9daa68f861e083d42779f43faaddf96/werawuruvonenemavu.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/pejawizoxab.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/64173135660.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924a18ae91b---xenofexoxefop.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7bdfe7500d48b0d6e830828374ea1872/86121685111.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4054c4d5b---49675598117.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a36cab675---zixilasotew.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/23108955108.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/pitobazaxapupigapifodin.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1609846bf313b3---miwenuribo.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/scss60175nff9racif254vk41s/befarisufuxasuzupodoxeb.pdfIn PDF document text
    • https://spyboarcams.com/files/99361460661.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/gasaguwono.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bf040a8f013---15827304056.pdfIn PDF document text
    • https://argumentua.com/i/file/16380097439.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/kelikidunumi.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/53813590224.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/8158134026.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=difference+between+active+and+passive+immunity+pdfPDF 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_off0000be2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE2E 11124 bytes
SHA-256: 8b47a2d7aab5e0fbbbe2f6ed147de95a2a5bac9264ca5f73f273936edc36156a
font_01_sfnt_off0000d80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01E 15652 bytes
SHA-256: a38e4c7ed2c029b981d7641d2d41b71488da9e051ad5a28c3e38021005940b38

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