Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e64615a5e4dcd01…

MALICIOUS

PDF

70.7 KB Created: 2021-09-20 12:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7ef42db81448e104a33887c25b49b3a8 SHA-1: a25943eefdc80fa7cebf10964ce8f6a9601c50b0 SHA-256: 3e64615a5e4dcd013a2ce5b64bcd7a96e67e01629effe2e421be3313a03f87ca
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 and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://mtkshop.com/images/uploads/file/bejumosotut.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161467d94b50e9---vojazipuze.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/99300541469.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/4fc6cee37153baafbcbdca4a84811223/ginuxiwiliwododax.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/fowusogugurafugobe.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7580709820.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/86669653877.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/u44jj1gn3hfe6og7lui9gio625/6960571318.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/mafezobakisilam.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/zegafefowefepab.pdfIn PDF document text
    • http://htygroup.com/upload/files/58654913716.pdfIn PDF document text
    • http://186086.com/upload/files/94543679555.pdfIn PDF document text
    • http://ecogestval.es/userfiles/file/roselipiwapon.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/75377750111.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/38382088113.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16146a3c793581---dufifakezugolawalu.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/36145118006.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134025c8b04a---26331223082.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/74028586090.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/1fafc12430735519327efe541a6e0360/reroki.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407ef160dab---vujufivivu.pdfIn PDF document text
    • https://digireg.sk/upload/63498911492.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcdf1edd83---49544038038.pdfIn PDF document text
    • http://jiab.net/userData/board/file/80082238024.pdfIn PDF document text
    • https://cowik.pl/upload/36486068983.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=fun+unblocked+io+gamesPDF 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_off0000b6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A2 10824 bytes
SHA-256: db11ec5a46adf1ed60536a1eefd7923ca864d850f88cac50404a35e0b58f6be9
font_01_sfnt_off0000cf52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF52 14856 bytes
SHA-256: 9f9805e1dde14d7ed7a7bac0981e52ee5c24b96b7521bc0dc76ce367b546f6b6
font_02_sfnt_off0000f4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1