Malicious PDF — malware analysis report

Static analysis result for SHA-256 6644ecabd6ee4a6a…

MALICIOUS

PDF

87.0 KB Created: 2021-07-19 17:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c3fe894ddd84b85bfeece227190c05a5 SHA-1: 122c8f6c14d03834a102e26252d7e7046cd546e0 SHA-256: 6644ecabd6ee4a6aad2bbff05d44f997fc7f32be6b679e6deb982f8a441e67e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URIs and link farms points towards an attempt to lead the user to a malicious external resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/4h3v13tvpfumeej1h9ntgqo6q9/49823991639.pdf
    • http://df-2.de/images/daten/file/87456418139.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160be45ab67608---81525893656.pdf
    • http://alhouti.com/userfiles/file/finibapexarutetozuzesiba.pdf
    • http://kleiberit.ru/files/file/vifovefixuletumeduj.pdf
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/fotoxibisulivetobuvu.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a883da4f62d---12635585841.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f9380734d---nilitev.pdf
    • https://akvaguru.hu/user/file/84149659264.pdf
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20136066350.pdf
    • http://flatadministration.com/uploades/fckeditorfile/mawikolabuxananig.pdf
    • http://finpacecuador.com/userfiles/file/bupapivebaxexa.pdf
    • http://tmfconnected.com/clients/6/67/67cd703e63b47da0cba1438f70967d25/File/32945486648.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/4460cd441c594b7cadf4ed9d754109f7/texivowon.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b90f2b1c28a---patilugolibovonivol.pdf
    • http://shreyaghoshal.com/konadnew/userfiles/file/xaxopevaje.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073e9342bb8a---63592296725.pdf
    • http://luingpyrex.cz/foto/Image/file/55314249242.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/d4e9ceade1f7ad61681ef0303fa011d2/pakapenelisejegavi.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/055a7d0fa01f502c39414cbb8c51e6d5/56755802692.pdf
    • http://multi-accueil.fr/ressource/site-image/files/61733747119.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609003d7eed37---giwenibilelojigabipopet.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba16dcb160---38289883342.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9a9c629f6---11034628856.pdf
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad736e7050f---nizijasomujowulaluzuno.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=log+growth+rate
    • 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_off0000f0f0.bin
c4ca532d333fd2bd22e3e6fa0ded2984ad71cd69bf2cc8f5dcbd63280bfacb68
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F0 10020 bytes
font_01_sfnt_off00010766.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10766 16792 bytes
font_02_sfnt_off00011f78.bin
76765db38f5d55ae0f1590c07804b72318a59ab64f2814075397fb163e0f4b8d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F78 17464 bytes