Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d0175e96ba09dce…

MALICIOUS

PDF

97.0 KB Created: 2021-07-28 07:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c2949875d40194ff4fb74c8fc0d36ea SHA-1: 3e7d7e2b553129163c129425af4140dbc73574cd SHA-256: 4d0175e96ba09dcea9edcc08e7a0480a911ac580d9a756ce748f7d960088ce7f
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://say-international.eu/userfiles/file/kivesemokodomebokadipim.pdf
    • http://guiaterrassa.com/fckeditor/editor/filemanager/connectors/phpfile/42989432761.pdf
    • http://www.peritaonline.es/ckfinder/userfiles/files/pilumolavum.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/ovnivrq44ju2p2omm305mf3une/36254557073.pdf
    • https://supermagnum-bg.com/ckfinder/userfiles/files/wasenifiwiva.pdf
    • https://autotrans911.com/thread/admin/uploads/file/ruzojafamad.pdf
    • https://artasedanasingaraja.com/uploadfck/file/daderovizopukatisupotosef.pdf
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/35530683050.pdf
    • https://regionalhealthprogramsww.com/images/file/23251982383.pdf
    • https://vnsteeldetailing.com/UserFiles/files/14632202561.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160798464a9628---97337482819.pdf
    • http://ghinelliarchitettura.it/userfiles/files/rolebi.pdf
    • http://lpkgoodframeupvc.com/userfiles/files/ranilerizozigu.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/5be5e1bd45bb3d373fcd67fd15d4041a/zazuziwajezexowonepi.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/ffrdkltcrm12iik0b14pab69cq/27658464926.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c636fc0b46c---53826192516.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6d0c29c49---6826387369.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/b7e32f5d0f4f300fd05e57bf1581b783/nelijofanu.pdf
    • http://aldo-ins.com/userfiles/file/54771830762.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4537b1e6b---xapadif.pdf
    • http://irollee.com/userfiles/file/78904557846.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160729bc068b38---vivotowawaka.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=starbound+how+to+find+better+weapons
    • 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_off000116ee.bin
c16afc064b265653e8f8aab0773b63e2c1f95db59b48e6534f5291583cc9e012
pdf-font-stream PDF embedded font (sfnt) at offset 0x116EE 10952 bytes
font_01_sfnt_off00013017.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13017 16792 bytes
font_02_sfnt_off00014829.bin
8ab1452ce2ed0ae08dd6ffb708fe762de145989310f0beef1ddf5f60732c69d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x14829 16824 bytes