Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b3235749909f942…

MALICIOUS

PDF

84.3 KB Created: 2021-08-21 06:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fb9cc2df19b368b08c3ce457c75c871d SHA-1: 0e891fd13e0bd02aebe1dfed9275eed23e8dc98d SHA-256: 1b3235749909f9421eb31724587d44e86119732270e9ad8be08fb29b920e07c9
104 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations and utilize disposable domains, indicating a link farm designed for SEO poisoning or phishing. The presence of a 'download button' heuristic further supports the lure of downloading malicious content. The ML classifier strongly flagged this PDF as malicious, suggesting it is part of a distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://garglob.ru/uplcv?utm_term=internet+download+manager+full+indir+kat%C4%B1l%C4%B1ms%C4%B1z
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/5ac6164df64069d8311c8a11f2489d1a/wopenabapow.pdf
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080449dc4165---sijirebate.pdf
    • https://semsaesp.com/ckfinder/userfiles/files/texajowerosironudin.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/f823e3d9ca7cba6bae557525b271324b/tewijibonopozij.pdf
    • http://saharun.org/uploads/ckfinder/userfiles/files/daposujurumiwabaravotofu.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d037760ce5---tabonufuwed.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160957135325d2---14733731511.pdf
    • http://championshipsportsrings.com/clients/23492/File/sajozid.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c890e72213---54338745390.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/288bb19fb377dfc3fd7b996d71e9b047/ziwuxiketesurebunuf.pdf
    • http://m2m2design.com/userfiles/kinifudoteru.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160adb18cadf7a---60681352555.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d4b194cfb4a---98599356815.pdf
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/53342431239.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fb7fb0502---turetatufiwazidilataxukid.pdf
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/mofariworuto.pdf
    • http://www.trotasierra.com/plugins/ckfinder/userfiles/files/nunapokamidufelidi.pdf
    • http://saintthomasmonrovia.org/clients/a/a7/a774d5b45fc75aba9c6fcf07501e1e58/File/32749764692.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d216b714ee9---sifupizogizamiw.pdf
    • https://mariellatriolo.it/public/file/3252578989.pdf
    • 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_off0000e0ef.bin
a35a0f9fe255bb2b190a8538b2a1b82eea88f4b0c1e70f8e191f627e697451ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EF 17764 bytes
font_01_sfnt_off00010f0d.bin
5fbd304800666763ca5d8aefdadfa1b16839d7499220481c2c422f6691a7246d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0D 11032 bytes
font_02_sfnt_off00012889.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12889 16792 bytes