Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0f9364b07a0635b…

MALICIOUS

PDF

93.1 KB Created: 2021-06-30 13:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 98423030995a873b053a176a76a0b193 SHA-1: 56161d4b6f07c338eab7387b896734ccbba3aa2b SHA-256: b0f9364b07a0635b5ef309081689e0d14dd83fe786378ed254d6fd03e9d38976
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous compromised WordPress sites, which in turn host other PDF files. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to distribute further malicious content or phish users. No scripts were extracted, but the PDF structure itself is used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/7616a5d72686f16f689d70a5e194b1f6/18730310042.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b9dd389ba8d---89232631437.pdf
    • http://hornets88.com/clients/56662/File/fipekebivedede.pdf
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/wawokalawajipotupagaxepim.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6aef958584582ff974deb1f3f3dfe32e/44251950864.pdf
    • https://responsible-tourism-alliance.com/content_file/files/texub.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/49631256e7fcc576b98664debc18b329/pavorumole.pdf
    • http://ubest.ru/images/file/94328616303.pdf
    • http://location-venise.com/italie_documents/files/8597503078.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c54ecc170d3---vamut.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c23ba7e1abb---zejadavadifazawixovixod.pdf
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c2942e524d7---29275595697.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/63a597d4efb1455bbf07f8f99f6484c6/mujosumitugosabafovik.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607be892a0206---monitiduzesazepusu.pdf
    • https://eseninternational.com/uploads/files/10098886723.pdf
    • https://maydangson.com/vietkiendo/upload/file/walusuwab.pdf
    • https://bda.ch/ckfinder/userfiles/files/pamejuzunumim.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acd7a45908d---67098086755.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be81a269f0b---xodepukajenejajabinibotu.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607741ae0f60c---822062754.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/n5slm1lg18dpmboo56vvd9issb/weduzabolamet.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b56a1d57497---2152494590.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/e9o5v2evnn8grpb57ockq1r3q4/6913059971.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b261290f2b6---rinumupa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=amazed+meaning+in+english
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d50c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD50C 16792 bytes
font_01_sfnt_off0000ed19.bin
f80b17a5de367346dacf937364fad291b0533e1dac84f1f8c5b8c7be6005d3f2
pdf-font-stream PDF embedded font (sfnt) at offset 0xED19 2836 bytes
font_02_sfnt_off0000f8ea.bin
01099548da628bd77718acaeb25bf6d20c39857f518ca634a78ff92b37aa8355
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EA 10420 bytes
font_03_sfnt_off0001100d.bin
d7d07c1bb2cb620831f2c37dd91ac9c06f810b466e68656ee79f96ba95f7afac
pdf-font-stream PDF embedded font (sfnt) at offset 0x1100D 23336 bytes
font_04_sfnt_off00014990.bin
0f2813f300dc1c95636b6fa340a6b7e4e843b350205fb3cc6d91371675d9075a
pdf-font-stream PDF embedded font (sfnt) at offset 0x14990 17556 bytes