Malicious PDF — malware analysis report

Static analysis result for SHA-256 6487d2dd01c828c6…

MALICIOUS

PDF

83.9 KB Created: 2021-09-07 10:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7cf5a40b3e7efc7aa6c771b22c65472c SHA-1: c3e21f702754e776a99fe751fb5978ad4d52269c SHA-256: 6487d2dd01c828c61a7f6587d8f467e7bff87382f63b77653890231d71824906
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to websites that appear to be compromised or disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://saptpadi.com/files/file/43580297210.pdf In PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3154c112e2---kamasovewizuvuxanawedo.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/40263550805.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/47872908311.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2d4dd680e---22071141161.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/boxebuxovaxudoxadoliso.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/97874596390.pdfIn PDF document text
    • http://bronia.org/userfiles/file/fejexokum.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/10722672165.pdfIn PDF document text
    • http://abnicum.com/files/file/nixofekinad.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/fefunuvog.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/cf9f6442e80a74746e86daeedb3daba7/6370855133.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202108/file/1629734157.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/15140267527.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/krpcf4kfbrn43njr672bhpmv87/vemitagafokup.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/25157214113.pdfIn PDF document text
    • https://mlspoland.co/files/file/refegovojikojumeritosurex.pdfIn PDF document text
    • http://lagrupacio.cat/file/85971731104.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/99167620104.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/e14c70a3ce214681e49969d161eda4f5/33103939026.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/kotepe.pdfIn PDF document text
    • http://aimic.com/userfiles/file/kugajokusexo.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/3cad67d62d6a3d683098f9f474e95ca8/22037053563.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=arthur+rimbaud+complete+works+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_off0000d070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD070 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE887 16012 bytes
SHA-256: e07e937c8348848a13bf28b87c037b69b33bb3968cb9c776ebd734e3c11b447e
font_02_sfnt_off0001121b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121B 18092 bytes
SHA-256: 18e85f5be209803c48d2ee26ef30c1b9f204efebec5819d9a8487e3c99373093