Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1864580c429a24e…

MALICIOUS

PDF

61.5 KB Created: 2021-06-23 10:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 555376503c0f84a402fef88fa2f9d767 SHA-1: be35ec50826cb981e8650ad369b15e12bb9f1204 SHA-256: f1864580c429a24ea70147a5aa86253ca931596a6be250acdbdb66617b49563f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://newat.ru/wp-content/plugins/super-forms/uploads/php/files/2af36bff60108fcd0aaed3acec8c1b4a/poxavepolapogokubupubej.pdf
    • http://myconnect-thailand.com/image/upload/File/fujenozotetujanibiveko.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076619db7911---bejop.pdf
    • http://talani.nl/userfiles/image/file/59904106992.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/df7df47857acddef678344a362757205/64651230091.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/a47890aee31a8c86133bf5b9fc2f0918/zolowaxiwu.pdf
    • http://scales-center.com/shop/fck_file/file/faxubuvesanawapi.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a1d45a247d290a063ac9e110d2a806e6/raguzapaxu.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900ac16b906---kizomigosizeneso.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/u1rs64n27e1j39b9u1k4v12rt4/733656004.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768d6dd7da3---durojepoxelubikaketis.pdf
    • https://kozhikodedeaf.org/admin/my_files/file/84849414006.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/5d4be542e160af2c91fe858168db6474/jonipuwamizilabupijodo.pdf
    • https://devcons.org/uploads/userfiles/files/lozis.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/gbktnjlh32vab2871ud6jnk047/kojetelipajodigeli.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=nys+highway+design+manual
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6a1.bin
7348001b4792bfdbdbac5974c855fb4fea8a2fdffd72365ec4400b7de5c2c14b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A1 5304 bytes
font_01_sfnt_off0000c8a5.bin
a3597bf9b410b1bc96d43a449a8a0c43e9f709ea883f40ae5bd0838de9751da3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A5 9548 bytes

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