Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ecc197fd7805343…

MALICIOUS

PDF

81.2 KB Created: 2021-09-04 22:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 38a4a6176aa087b61a279f40b35ee7fb SHA-1: 607a21171c122dcc8cae90ca1d9e49ed651b5204 SHA-256: 6ecc197fd78053438050abd964e2c149618454a9119ff0b9ab09cd379d54a4e8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and numerous external URIs, many pointing to potentially compromised WordPress sites, strongly suggests malicious intent. The ML classifier and ClamAV detection further confirm this, flagging the PDF as a phishing or trojan delivery mechanism. The embedded JavaScript likely facilitates the redirection or execution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2108300024565640486kjpwc.pdf In PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/filimesixa.pdfIn PDF document text
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/pututakovudapixo.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/87244139413.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609155c7d88b7---tasowudefurot.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160b345400fcb5---vilisox.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/48814388635.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/17210863845.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/renevobijokivenazopuj.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160cca12889e7b---jariredi.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/tulelalabewidopub.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/guvivezizi.pdfIn PDF document text
    • http://renovator.cz/files/file/manevek.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c92bed612c6---zifepunesetu.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa387a2c6f---64860250309.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/tiwazevedo.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf6160f718---90955750888.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161008e0dd1c14---rarir.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/769233a60c67237419c0a229b2b8679b/melikisefa.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/33963765008.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/47872972570.pdfIn PDF document text
    • http://bereanbaptistashton.com/clients/1/1c/1ca8668e480cca1e897b6add33210fc6/File/76786029809.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/n6plkkssob9fmjta0gtqi9p3js/pedolitufevufobafumofuk.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b825dc70268---wedofugijiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=pdf+drive+app+for+iphonePDF link annotation
    • 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_off0000db80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB80 16940 bytes
SHA-256: 8fb00cc6fa7298a3b9db6184da6b5336bab43b0038100f09a64eb7bd0d2ad81b
font_01_sfnt_off000107a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A1 10352 bytes
SHA-256: b26ade87b7456099478f5243b7317fd0fb92be1a702ed8e1f5ab3d4d88b57861
font_02_sfnt_off00011ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1