Malicious PDF — malware analysis report

Static analysis result for SHA-256 966a5c5911d2161e…

MALICIOUS

PDF

68.9 KB Created: 2021-10-04 03:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 067331a0315a4d33b4381861b2e06356 SHA-1: d2e82a86d430105cb6208f86d001048353064584 SHA-256: 966a5c5911d2161e50a14b6191286f3a2e5b4ed230aced1bcc3e31075282b1a1
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised or disposable hosting domains, which are likely used to distribute phishing content or further malware. The presence of multiple links on potentially untrusted domains supports the classification as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://lodoshosting.com/calisma2/files/uploads/14283811890.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc0fa2b532---kituvom.pdf
    • http://thaiboxes.com/piceditor/file/40335488505.pdf
    • https://cytokin.ca/upload/editor/file/99689477927.pdf
    • http://secohthailand.com/file_media/file_image/file/11696309831.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/2453c90dc6d84fa06a698fa6dc8f2e53/kusirorutezuritavuwilepas.pdf
    • http://revize-elektro.info/UserFiles/File/45906463102.pdf
    • https://nsck-cykelmotion.dk/userfiles/file/32508906957.pdf
    • http://alltechsro.cz/files/13254810644.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613514beaadd4---wiponeviturara.pdf
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/tazosuluredegezagu.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613000f07ddb1---lefog.pdf
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/tibawutarawuva.pdf
    • https://netlandschool.cl/files/96627237677.pdf
    • http://adriennemason.com/assets/files/92832367364.pdf
    • http://www.hangmandigital.com/files/file/joritujavewewo.pdf
    • http://snieznik.pl/userfiles/file/tulasunebonigam.pdf
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pilive.pdf
    • http://grandioso.asia/editor_upload_image/file/mizomemoselubaguni.pdf
    • http://amicissiapiemonteisa.it/userfiles/files/79521363781.pdf
    • http://wowbond.com/upload/Fckeditor/file/patuwolanikakexop.pdf
    • http://studioingtassinari.eu/userfiles/files/64847442806.pdf
    • http://adance0112.com/upfile/editor/file/3647825023.pdf
    • http://ueros.fr/admin/ckfinder/userfiles/files/durat.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=what+are+the+big+four+macromolecules
    • 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_off0000af76.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF76 16792 bytes
font_01_sfnt_off0000c788.bin
dced02844c047479d594352c479468300bc605d2ffb4dfb54bdada20e2676982
pdf-font-stream PDF embedded font (sfnt) at offset 0xC788 14708 bytes
font_02_sfnt_off0000ec74.bin
f3d4b162f0df0dad51463b01d4f8a70696e3b5709b0e0ece3dc3a4c8514bce50
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC74 10912 bytes