Malicious PDF — malware analysis report

Static analysis result for SHA-256 03112f204c7ee6a6…

MALICIOUS

PDF

109.8 KB Created: 2021-06-30 09:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 76146e804a4639b98e3f6c8df0a0b53b SHA-1: 94b437f8b6fda923081275ee8d10715341e96630 SHA-256: 03112f204c7ee6a63c4148f0f16eedf5d427d6790e19e2dbfc10f8762b28d0ef
96 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress upload directories, indicating a link farm designed to obscure malicious destinations. The ML classifier strongly flagged this PDF as malicious. The embedded URLs suggest an attempt to redirect users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://crysiq.ru/uplcv?utm_term=advanced+physiotherapy+and+wellness+centre PDF link annotation
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef3e0aec9d---rajikop.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/pibatasonurigilanoxowup.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/dalen.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d706da7f47f---99754657494.pdfIn PDF document text
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/29151577331.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/nifudiduvonuwewakuvibab.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/i16ba5nrvar0p7sfvh1m9gj6k7/16254917459.pdfIn PDF document text
    • https://pubs-icfas.org/icfas_new/dev/ckfinder/userfiles/files/89369308003.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/pokenixireja.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9c3e0f9d8---ronijurebevexitipozuna.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/42913946892.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caaa11e283---97916530929.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7617b9f0de---80683794756.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/vemov.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/dozigebufumeravewozami.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/lukuwi.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/ud449in13c6qvigjqaq6snbutg/fapezosabavedawikajuropop.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e613088251---89967356801.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/ledifoxodosubolakitix.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/294003e1a746217248ddf1125b2b8db2/luwipewirikis.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/kakavivuxodapojibekej.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c288e148b28---55382187406.pdfIn PDF document text
    • http://nctpa.biz/clients/5/51/51e593b678cc4707ea5ff7b662bcbdb9/File/tarove.pdfIn PDF document text
    • 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_off000149f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149F7 17888 bytes
SHA-256: c6a81fa1cedd955cb2493f745282161d7cb699b6ffa5807bc738a847e8b35192
font_01_sfnt_off0001781e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1781E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19035 10856 bytes
SHA-256: 41c2e7312110af96eac4bfb3046d5b869847d75610382c601e89d2263cc2048c