Malicious PDF — malware analysis report

Static analysis result for SHA-256 51cecee2a7d3df7e…

MALICIOUS

PDF

90.5 KB Created: 2021-07-08 13:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2c1280e3e3819ae4ed47c8763f6e89b0 SHA-1: bc687a173302b3665b5b6ab93a83a313de6edb61 SHA-256: 51cecee2a7d3df7e43711e3257e2a05ac0d5e0c81bc7016ff784ea386944e4d0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and does not provide direct user-facing content, but the heuristic firings clearly identify the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/dkvngkrf00r2b5fedumg78taos/78287204698.pdf In PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/7f96b2a7affdef6323fc18057636da9d/taxefidulunolofariwuz.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/efc70866d80e2667b1500d18cad55048/mikigopelogoveluletewofuk.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/lazewafoxobole.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/97656c7db0bcb062bb64f86655c304e7/6202944301.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d612f1453f---40149106523.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/662b58b6212fdd13546ce13de12e0b6e/82939247386.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/gobed.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/6e01m7isqnc66s29c336ff7os1/zedokevunimud.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/nelivadamovutu.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/92496929972.pdfIn PDF document text
    • http://fairmonteast1975.com/clients/0/01/014dde3c838f86fef2ac1d31a86c415b/File/velasibadizujofazif.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16071259de180e---74740718301.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/211011fa68d9ddc595880423a5954a26/karininapakativ.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/5247031266.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bf758b6ed---goxomokanixe.pdfIn PDF document text
    • http://ronniejoymemorialfund.com/clients/1/1a/1a75100f29d804137a154ca93ef51a80/File/36709503706.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/033kfhuk1eqhcoqu6heo7c7j8s/kenalodapen.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/lozedimoviwekogubisu.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1608870b11354f---77446008930.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/45716554982.pdfIn PDF document text
    • https://topupdana.com/contents//files/ramitisokadexekipi.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/lisofasagul.pdfIn PDF document text
    • http://worldwidefilipinoalliance.com/uploadedFiles/files/63276830300.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=tertiary+friend+meaningPDF 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_off0000f6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A6 10440 bytes
SHA-256: 760c67ffc0f3f540396debfac0ac39ce2131e022fea54505bc8338ee5c06bfb1
font_01_sfnt_off00010e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E12 25384 bytes
SHA-256: ad3c41b3daf5aebcca0948357603b23b522ee98bc34838d8ac93e50ec438970f
font_02_sfnt_off000144d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1