Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ddab7b614934acf…

MALICIOUS

PDF

123.8 KB Created: 2021-07-05 00:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3ddbe0cfc8c2ab676374894b71b1ca71 SHA-1: 17076a12ddb140c3e5d5d9670153f5379ab9fbdc SHA-256: 6ddab7b614934acf50450c4c82333037bfae1e41b82f9aca12b5b55cf3e59cde
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common method for initiating malicious actions. Several heuristics indicate that the PDF functions as a link farm, directing users to compromised websites and potentially disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hourinkan.net/js/upload/files/zubovefofeloxasejabovatit.pdf In PDF document text
    • https://alianzatours.com/imagenes/file/23839794113.pdfIn PDF document text
    • http://camonetinternational.com/files/file/mewinigumewu.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/50b78528f5c8383de1a5f0f307c0cec6/rusawewiboziden.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/bokusufesetaxuduxema.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/03a26344f57619613ba511d030625d56/lapuxulajibevuxajo.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a766ab1ddf3---masojutadepukunofavu.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/mumepisileritumumanij.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/89708869406.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072dccb283fe---tizapujofagaranivaw.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4f4065da0---61429053525.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/84971913035.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/4kfh6irbqp9b2ac4g8kt33ncpi/94730685030.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/b9c82a2367909aa166f1b84fdf417505/55611597658.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=commitment+in+arabicPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00017d84.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17D84 29028 bytes
SHA-256: 7695deb222d23645089b18a82739059353fed9cd95c695eac6abfa7d456b4d77
font_00_sfnt_off00014e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E14 10348 bytes
SHA-256: 910d411bed55bee896b4f40620c4e994c044cc9bdf6d2e3283e77d3b46a8bbef
font_01_sfnt_off00016573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16573 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001b177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B177 18872 bytes
SHA-256: 115a3a6fc5ea39441431ab6833da1c3f5b8020e0faa179c627f595403ed05c6b