Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e6a903c4c0c8a63…

MALICIOUS

PDF

106.4 KB Created: 2021-07-24 20:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f0234c4e34e1347b04d5065260e130a SHA-1: 8ccbb24366d33cc43ceaca2e7c2fcdfa489a41a4 SHA-256: 6e6a903c4c0c8a630f21f347247b6039ef92e53992f3bf43b6ec59883a0c7294
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing lure, utilizing a link farm hosted on compromised WordPress sites to direct users to potentially malicious content. The presence of multiple unknown URLs, combined with ClamAV detection and ML classification, strongly suggests malicious intent. No scripts were extracted, but the PDF structure itself is designed to facilitate the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d868d778cf---tonuwikelavopo.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ab23db4189a---volukol.pdf
    • http://dok-vo.ru/userfiles/file/35343709942.pdf
    • http://supporttmes.com/clients/2/26/2647aeee05d38019bb2ff7af4ee9f9d5/File/felufoza.pdf
    • http://tunesistudio.eu/userfiles/files/60054288700.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/2bad88e21faac545aeb0445568dc0056/darapizubolebiw.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/krmvg9tnd9t3e5gqevoa6ibmg4/buwigodukukinibeneba.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/e755b8be34d999480f2461d095df7301/17377799208.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ede0cbe29ae---lolexuzasiruge.pdf
    • http://accessiblevehicleservices.com/userfiles/file/50425545213.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/47bd855e0d9c33641303edadf037d476/nadovidamolomigu.pdf
    • http://rhodeislandalpha.com/clients/56223/File/2404622714.pdf
    • http://opakowania-loga.pl/zdjecia/fotki/file/81451887629.pdf
    • https://daxitrip.com/basefile/daxitripcom/files/fawibo.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b06c6d31ec---sorejiviwebifoxezomiv.pdf
    • http://velocimapper.com//webfiles/file/puzetalafes.pdf
    • https://candbco.com/ckfinder/userfiles/files/tunifenegemogapifij.pdf
    • http://eths1967.org/clients/6/6b/6b000f7c2bca5b3a89f93fde6b54c5e6/File/nemedaleturewirupanemaru.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d98ed3595d---30336913687.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae2fcb2c38---tevotorekomufexikarave.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e8bfb899850---3254923810.pdf
    • https://aduanaldelvalle.com/userfiles/file/magovumilowidiwedefake.pdf
    • https://lapalettedesarts.fr/gestion/file/dariruxuwenagodudaxe.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/f2fe86643f4a99add180d0148aef35a2/5925527989.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084191ee916d---pegolukam.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca2e9edf22---56211200390.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=chucky+movie+2019+cast
    • 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_off00013bac.bin
5065f50e9dd6ef52b5d312131ce2009998f3fabd17dc21de04eac80a3e74f720
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BAC 17420 bytes
font_01_sfnt_off0001690b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1690B 16792 bytes
font_02_sfnt_off00018122.bin
b8a4412647dbeead3abcc5db1d481fa9dbec19d112a92639a5f3f34a63741d1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x18122 11112 bytes