Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d25d978af4cf9db…

MALICIOUS

PDF

73.8 KB Created: 2021-08-29 06:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 7c64ae3a492b99c2f78128a4cf88d45c SHA-1: 4f9e86b6ffef06862114195d29627b27335f57d7 SHA-256: 7d25d978af4cf9dbf6f6a548e581341adf56f58705119522d73a414c1a667395
96 Risk Score

Malware Insights

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

The PDF file contains a large number of links pointing to various external websites, many of which are hosted on compromised CMS platforms. This behavior is indicative of a link farm, likely used for SEO manipulation or to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/e39ad001f2cea0aa5f58b064afd9d2b3/makubozof.pdf In PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/f33efb291ec74219a956a76cae196c00/10274097240.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/nalalomafefo.pdfIn PDF document text
    • https://szud94.hu/img/sajatfile/files/kasidogakufama.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/49571042394.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/lenisupitesesanevedokexe.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/0ac7aa54904bc89562e3432cab176ee3/43304892117.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/arlso4u8uao7ooqhqnrjeavs54/8659213100.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c42de6253c---sugalavolodul.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/4359a47ee4007a857eb5fa1fa1838122/58246699148.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/t67n4cvir7vhs0fcsmrh6fk59i/92242542710.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/eebaa6ee3478a4e71e96cd859bc97c68/50876895264.pdfIn PDF document text
    • https://arerp.kr/data/file///wugabekazutof.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871652c5871---ludesaletixaban.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec4ed5fbaa---60717057046.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/03fe646f3949baffade241f29ae1be6f/zejuzufogefobelufut.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/60853049230.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609be4191e38b---76142977033.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe2a1b9fa4---24704367825.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/99867265154.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/b44b722417a6b82884b8b0b03c24cedb/74318393268.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=fulminant+myocarditis+with+combination+immune+checkpoint+blockadePDF 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_off0000bb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31E 16864 bytes
SHA-256: e03213d5cb9bd9daaccc4ac64f39f793e65d65cab07ff5b066e1fbaa1c134735
font_02_sfnt_off0000fe94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE94 11288 bytes
SHA-256: 6682db3e6da04363f28132edbcbcef32f5e721d8a1fc85fb9843780da2a130d7