Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc4139f6e8d9f32f…

MALICIOUS

PDF

75.1 KB Created: 2021-09-16 20:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a7b6d0ccc6c94949e817b61729059071 SHA-1: 7dfaabc6299fda5363d3aa10e37984d24ddc42c8 SHA-256: fc4139f6e8d9f32f5564f1999fd1b7e628dc9ea2c796ff7af85aaaf20a01f2f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs that point to various domains, many of which are hosted on disposable or compromised CMS upload storage. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to distribute malicious links or content. The presence of embedded URLs and the link farm structure strongly suggest a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/buwojapimimopunidexuduge.pdf
    • http://assytekservizi.com/userfiles/files/96212224677.pdf
    • http://stavebnevyrobky.sk/www/upload/files/62316146244.pdf
    • http://mylodge-naoshima.com/images/blog/file/68277514433.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/96cc0aa52ed077362d28c95e86e976c5/46111103740.pdf
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/tuboratu.pdf
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/22113879831.pdf
    • https://speculatio.in/userfiles/file/rokarazagalifenorix.pdf
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/35307881242.pdf
    • http://easyhypermarket.com/userfiles/file/xenafopanujekop.pdf
    • https://cooperadora.grupocreartel.com/documentos/archivos/25263063018.pdf
    • http://flyingwedge.com/uploads/assets/file/xifexoxibif.pdf
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210902051842.pdf
    • http://novafish.it/userfiles/files/todeguxenuti.pdf
    • https://chambres-lannion.fr/userfiles/file/fagadozipajavapazosok.pdf
    • http://denis-lefebvre-services.com/fichiers/file/22685127182.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6449d753b---16345305359.pdf
    • http://dsagco.com/Upload/file/lewonakogapebutukaj.pdf
    • http://lsneotek.com/ckupload/files/74388197391.pdf
    • https://beautifulhairstore.com/upload/files/zajofofisofemepubasezu.pdf
    • https://francemonde.news/UserFiles/file/sisuxakubunugojet.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416719b7ca6---92748824684.pdf
    • http://sarljarry.com/userfiles/file/40521486079.pdf
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/xuwafujovowidijafot.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/59985d7da04c0fc6b244716a9a88758c/20964324044.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d1e48b7f0---86991787728.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=u78+smartwatch+app
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c24d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC24D 16792 bytes
font_01_sfnt_off0000da5f.bin
cdb60d7027e19dfc7abc31ecc3adbf79cb38e8b39ada1c6beacc2b17f8f2364c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5F 17088 bytes
font_02_sfnt_off00010682.bin
083698a40de8d450b6d65e8788297ad4c4f4ae2c8eeaa24e694b1951769a2477
pdf-font-stream PDF embedded font (sfnt) at offset 0x10682 10496 bytes