Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f66488e02be693…

MALICIOUS

PDF

82.9 KB Created: 2021-09-03 06:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2990a6a7726398029fb47e190e7ba508 SHA-1: cc360c5d31f4f96c0d2830e32d31011452dccbf4 SHA-256: f5f66488e02be69365d8459e7cdf04c1f92880ffde4b79fa010e42d378cf5386
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS upload directories, suggesting a link farm designed to redirect users. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=how+to+save+pdf+with+crop+marks+illustrator PDF link annotation
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891a8aa8bc8---23638158799.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f973bc122---74676011651.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/vedijixefopix.pdfIn PDF document text
    • http://citysuji.com/ckfinder/userfiles/files/94540012765.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e0f5e1e1d---23014049008.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/24036426031.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/60037356571.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • http://ty-universe.com/image/files/20210622_165113.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f28b84a60---namorukutopuweja.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d21fc9566a0---subawikof.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/93600646770.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/igetusisinuv.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/99506097815.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce55c176de---ribepoji.pdfIn PDF document text
    • http://artediapharma.com/upload/files/97523852681.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/fetamezuvesumigitidobufiv.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607c1d97897b2---zedurijonizurokizovit.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/26a6ab95a437a563b2668ad3e01a374e/rofomidenozuduvadix.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/5b0f1c0f7ef163768c4b0fdfb9b43612/58483380075.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa82269a198---rumurigalaterotamem.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a948cb2a8c3---87332074197.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16072c6cfc5ea7---govuj.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/977775342.pdfIn PDF document text
    • https://digireg.dk/upload/nizonuf.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/romiki.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB1 18012 bytes
SHA-256: 59d35511252889f38139869835e3dd357efae7118036261b12d712a1fba92425
font_01_sfnt_off00010b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B65 11116 bytes
SHA-256: 327e1918db8b3de23c769de6d3a20f1384a4ae6c301709096ae28aabff712984
font_02_sfnt_off0001255d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1