Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cfcc754ed3e3e8f…

MALICIOUS

PDF

100.5 KB Created: 2021-06-27 02:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 98cf70bcf28c1a5b5f3079d31d0264c1 SHA-1: 8f3825ba5ede183d8bc7feb0af16e0f0c2dda8c4 SHA-256: 3cfcc754ed3e3e8fcfb729b70eb1e0cd6a7fc0dd457083b6e890c140c45ab626
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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 http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf16c8a60b---tarumamobarab.pdf
    • http://shipagents.nl/uploadfiles/file/zekagumosare.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/an2efvirqovi926dauiqgegdds/4758100130.pdf
    • https://houstoncoinshow.org/FCKeditor/file/mejose.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160be80b255d0f---wexiwudisedoxulivumekix.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/3qtnlacrd5nubk031onalbeg07/21007744447.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/7d0a9791fd663896a60028b1f35f4cb2/mozeforaponiminamu.pdf
    • http://nessium.fr/userfiles/file/batolosedamifa.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/iov2p7fhivkb9jks3thmp09s45/70964191349.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/aqd86ne1ce0542256adrs27g2u/voneraku.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/9a31a68f1269224b21ef51ecc28f41b4/nejebujigobuzodutifid.pdf
    • http://asianmosaicnyc.com/userfiles/file/zotovofasuvozete.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/5412154707.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/mfs250prere0frt9h5uskpj075/luvopal.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd489df8bf---58318553497.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a68e769c122---kazabagewof.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/99d6dd84e4ef4de804aeba7f10236f83/33837134234.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071380dbb389---dudotaxowon.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ad7e93af1---99459863180.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085174c64250---melolipesarowubulerup.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/f79m75l4e2i112046p6l2rknq2/86813529030.pdf
    • https://binarbaidrealestate.com/public_html/userfiles/file/71129978005.pdf
    • http://sushikyototogo.com/uploads/files/65404222096.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=i+want+to+separate+from+my+husband
    • 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_off0001273d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1273D 16792 bytes
font_01_sfnt_off00013f4f.bin
f241ad3022968152fad30077119c8d99eb9f4a4537980a5ce3161d7264859120
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4F 16964 bytes
font_02_sfnt_off00016b48.bin
5b8b91cab73e511453b034eedf97de62c3a87ca4924501c58a9fa0640e88858b
pdf-font-stream PDF embedded font (sfnt) at offset 0x16B48 11016 bytes