Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad487e5c7f93d19…

MALICIOUS

PDF

83.5 KB Created: 2021-06-30 10:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d0ae2bd981bd3a19f7b20dafe137cf79 SHA-1: bfe40cb66617a2ac5405ffd58cdc9dedeec2433c SHA-256: 5ad487e5c7f93d19e55e69c511c1c7a2e54a6a9b57b8bc3f6f39c462fddb20c7
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to compromised CMS upload directories. These links are likely used to distribute phishing content or further malware payloads to unsuspecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://healthmatters.me/userfiles/file/24858889105.pdf
    • http://hzkontejnery.cz/ckfinder/userfiles/files/14447053093.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/1e7414dc49a307f6b1b5cef598c0b550/49916558546.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afec8b2ebf7---55230625965.pdf
    • http://dok-vo.ru/userfiles/file/88834437979.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/p8n0ahibni5ee7kj2958au8o0a/19667398064.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4bb0437c7---7971061694.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607285addb2c7---33349023592.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609788e352787---53006622692.pdf
    • https://tsegypt.com/file/11973139967.pdf
    • http://ampletrekking.com/userfiles/file/kezuvoni.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/uuga0p0rj95hg12mu2bo9uuhm9/20100961016.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bffcfbd88b8---dowovubadusikeritireriw.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/af0b9dacc3aafa7d45182eccb1d90fee/10914357608.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202106110221095337.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b87a6a1bb4a---wazelosekukapowuvite.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/o3q3giqpklbmndnp6rsrfa39b0/47168164392.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/2kmulcd9rab8a6dvuqltp6u9j0/suwipuviremolafesofom.pdf
    • https://airbays.com/userfiles/file/47763740451.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/f77e20393fc7566d76f5df4bdb63098a/zojezejobigaf.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/64baa5dfbc41a530ae945127c8b6f9d8/pujozuzuwinumupageji.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=curr+opin+pharmacol
    • 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_off0000e274.bin
19089dba65ac56fef413a104b6207e164d97b640a29000d72b55eb731c86a2dc
pdf-font-stream PDF embedded font (sfnt) at offset 0xE274 18400 bytes
font_01_sfnt_off000111e9.bin
e1d692b8dc27152bdf8bea4f996f301bc9c64fa9ef488429d0d05a4ebfb11ac8
pdf-font-stream PDF embedded font (sfnt) at offset 0x111E9 10372 bytes
font_02_sfnt_off0001290b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1290B 16792 bytes