Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b20e8e8f520ddf…

MALICIOUS

PDF

75.9 KB Created: 2021-08-09 13:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 68409637dedbdf354121c7f618ed6065 SHA-1: 1589570c1d727a6981f1ccd8cb685403e1d10435 SHA-256: b9b20e8e8f520ddf527cd8e23dded7159487775081e755d83f6c3191a271b2d7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/29m8vielsqgq6vbjaumcjrne83/fasepuzijinareloriku.pdf
    • http://cameralehiep.com/hinhanh_fckeditor/file/67112462872.pdf
    • http://smepil.com/ckeditor/userfiles/files/batexokinexewenago.pdf
    • https://jurad.eu/files/file/busin.pdf
    • http://oshcongregation.com/userfiles/file/kukibikozukute.pdf
    • http://everest-c.ru/ckfinder/userfiles/files/11206274360.pdf
    • http://ilturismoinitalia.it/userfiles/files/daligudinuxelujuxotamuk.pdf
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mulizadulil.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/rcp5p6l9d219bpeslu4c74iqhj/sefakamanupeside.pdf
    • https://medosojewellery.com/userfiles/files/ziwesujavinetil.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bd5bff2d1c---68451719227.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/240cbefb70439d06f39f3079f8a0755c/zikesipezufeganebose.pdf
    • https://bdaudit.ro/userfiles/file/14947414730.pdf
    • http://aven.su/userfiles/file/wibudakiz.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/f0c0647ead4cd682bf2043e66b3610c4/50748461134.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/91ddb1cb272f093e7381af477e6cd725/15429676650.pdf
    • http://isagenixmakessense.com/ckfinder/userfiles/files/86080351194.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dc3d012134b---kumivegud.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=apostila+de+anatomia+e+fisiologia+humana+pdf
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/lepovotobuzodulujixe.pdf
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/ae2e65f086fa5e06ecb331efcb774e71/poleladevu.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_off0000c6b4.bin
aa3a01809f45f55d13eebbc51f766f0011605116c88dab972f3ac16554209098
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B4 10928 bytes
font_01_sfnt_off0000dfa4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA4 16792 bytes
font_02_sfnt_off0000f7b6.bin
32a49b5bd683c163bfe6634b1ee8b0a2bf5aa93827e85fc85a1a25a48612e026
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B6 16280 bytes