Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5901cf86eab301a…

MALICIOUS

PDF

74.8 KB Created: 2021-08-30 12:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 15ccb6ec254e6bcdc6cd88a8b5f773ed SHA-1: 0ae646b086c2fc44efd9cef58d2dc5dea23a91da SHA-256: a5901cf86eab301a4e4862412b2fac02cf0e8f179eee10f6e945bbe612694ff6
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

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://nacyc.jp/Upload/file/3250922451.pdf In PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607c219fab518---dabulusumanolenetudisuk.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1612a92b184284---97558932296.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/54ko8epp171bhtfmmirj388698/93621944502.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/wolifav.pdfIn PDF document text
    • https://harom.ro/files/file/basaseven.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ebf1793a8b0084eb313e6eac7e9cd2f9/28039922821.pdfIn PDF document text
    • http://22743333.com/userfiles/files/32092463212.pdfIn PDF document text
    • https://makenie.com/upload/files/70580649655.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/35950465899ad32fbded95e44f9d1175/20525538361.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/rirutazaririrode.pdfIn PDF document text
    • https://artbynela.com/uploads/file/xulonojejufosotas.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/4j424t3fkqir2047qj56admk4e/5239765747.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161055090672d1---tepawavokuka.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/porudixosunes.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/kivivu.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948df0ae464---nelota.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/wiwovobetames.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/79845482566.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/25871780812.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec45c8326c---jojavavegepagora.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=critical+theory+in+public+administrationPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210813/16288686385179.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_off0000c34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC34A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB61 11164 bytes
SHA-256: 08d114f5d2d932f5a618d76bb847c3bbae07a8c8ced9ecd5a9bb32f6b802a0cf
font_02_sfnt_off0000f512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF512 15448 bytes
SHA-256: f05f66ea325c58f4a41c113a374b51dbde4800796255f973b9f93d688ec5626f

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