Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fd94991b055165e…

MALICIOUS

PDF

70.8 KB Created: 2021-06-30 23:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 996fee0434668b8cf7d589d4719ef2e9 SHA-1: 918d134507bcb7cc5c834e2de88c1d58023ef0ce SHA-256: 3fd94991b055165eaa8082327bed984ece336bf190f564ab2b4367f75d2f28aa
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and does not provide clear instructions, but the presence of link farms and the overall detection indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/mogazokurawibarujosopa.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608867f409736---jupavafavadiviz.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98eaf2b7c---37782667605.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/qu0qcbs9haa7jfsdpfoh18hj63/67224127183.pdf
    • http://j-line.ca/fck_upload/file/4163508794.pdf
    • http://vita24h.com/uploads/userfiles/file/bemesekubewulujotuzonew.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a6c055afc---82068821923.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1a7cae7dd8613e1135aad56b56089b74/runelakib.pdf
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/47972216919.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e9aae304e---vifopevisuzuzaje.pdf
    • http://outspokenholland.com/userfiles/fckFile/20210515202653.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160845bcdef77b---82645427720.pdf
    • http://kochamsushi.pl/UserFiles/file/21410397619.pdf
    • https://airflow-skateboards.com/upload/file/xemasisimerumogedanakew.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/5f23370ff4676d1ca585bd91bed775d6/64449448966.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/80914bc64aee5958d6e712d86b9faeab/wiworon.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609db246a7f0b---medirisuralumidegi.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086965b2a9ee---48700994907.pdf
    • https://energooptima.hu/upload/File/kadafozexidunew.pdf
    • http://cosonhuath.com/hinhanh_fckeditor/file/farikiwujijad.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/q2eauj30bhmuni3q2kbnjmurk0/51672432867.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/aa0dfaf852b2586337fe1bb7708b9c09/95227443357.pdf
    • http://geredekombiservisi.com/userfiles/file/64883323196.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606c790dbcb29---zifer.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=road+sign+png
    • 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_off0000bb93.bin
0eca8fb20b82d2fc72f4a5b445bdc8514bf1c291a685d824cf6956a8c9034de4
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB93 10236 bytes
font_01_sfnt_off0000d263.bin
f3fb6e4275045db3a25f8f183c01f3b7fde647dda299d161cf92766e3f17d149
pdf-font-stream PDF embedded font (sfnt) at offset 0xD263 14256 bytes
font_02_sfnt_off0000f5e9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E9 16792 bytes