Malicious PDF — malware analysis report

Static analysis result for SHA-256 f307148344adc1cb…

MALICIOUS

PDF

88.1 KB Created: 2021-07-10 02:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e836ffb3ffc053698225666431072c7d SHA-1: 31b4424304be15c805daaec1bb8ae2f56c53057b SHA-256: f307148344adc1cbb0add8667ac3b88671d5461108074bf3c927154e9feb7c9e
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. It also features a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute further payloads or phish for information. The ML classifier strongly indicates maliciousness, supporting the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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 https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/98b6969c98b27d4eba2f72de9ab90dc8/41600491837.pdf In PDF document text
    • http://apsencollege.org/test/fckeditor/file/85937479512.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/34610431333.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/dixafibugadef.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/fg5h8m91k4hq1q9eopudimut5v/zenaxekabowedubugesin.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/hbbh1spalqq95l9rvq90v1oqem/13378403435.pdfIn PDF document text
    • http://bociany.sk/media/file/83979083346.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/toxakuzagelusunukerosoj.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/85312760156.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210710_8FDB386D7583A476.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/70640677343.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16073682299eba---56780731383.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/galewefegukeniku.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/77f7a3e467d9a0d99cad952b125641ba/7156171550.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160793295aef5e---78372199453.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ltl4ej6iaa0qst01bjveoh1jp9/bazemibefopipe.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/95866883603.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075f19697a42---kenixawupasodukipi.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094229c3e525.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/41f5b391362a79da5a1660801c159b2b/33001562491.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/37722988367.pdfIn PDF document text
    • http://teifsepahan.com/files/file/99509520637.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/p9t8mhiagij4luajh6mno897fs/xoratobubotolimariruxepon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=displaced+rib+fracture+treatmentPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E7 10904 bytes
SHA-256: 169ec952982f1e13c1fdecb24c24da911be918b2ddad81d6fe0d7fd93a0a9de5
font_01_sfnt_off000110e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E3 16352 bytes
SHA-256: 836b381bfeda94048b73fde4889e284d57ce656ade8a8accedd98a3fbefc2fab
font_02_sfnt_off00013b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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