Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c252dd7e314746…

MALICIOUS

PDF

108.7 KB Created: 2021-09-01 13:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 83eb98233bbd5d972fdb71cbb2b95b54 SHA-1: 0c4851d2bd17588fc457df1336e672365fc2f4b0 SHA-256: e4c252dd7e314746fa67e96cf02098fe778f29004996beb83a58ceba436cb3c5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript (T1059.007) further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • 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 https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/3tkm0u251in41c54m2rc2i344b/mejikozisokerojez.pdf In PDF document text
    • http://bidhichand.org/sahodyatarntaran/userfiles/file/sivuguridirapedit.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/1sbi4kc78qcgp9rar6nlvosu4r/sirimetefovikolokuzaki.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/3133038728.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5ded69d20f---2401584352.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/sikukezadoz.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/gexelak.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/9812898347.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/fumepipapozazemisofen.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796c992afb8---85111276387.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/dogoluzafurumilemufeg.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/gajasokeludojedijawo.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/77471105298.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bd380a84c---25315773617.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/podulatufolatumeg.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/8dc69bcc5fef761ac59c3b0de7bfdcd1/gogukefubupel.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/79125241dcc325a84a16ab1d8ff2745d/85305084153.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/48153411289.pdfIn PDF document text
    • http://alliance-vietnam.com/upload/files/vevapetujuxogutetur.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f45b77ccd---zoloma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=creepy+house+picturesPDF 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_off000145aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145AA 18364 bytes
SHA-256: 6838b915548de24f807ab2a64cc5add6ef2298f0cebefa6f7a6a6b71102e4175
font_01_sfnt_off000174ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D03 10404 bytes
SHA-256: 9a99e1977705a4681c1cd0ef75050154f154ec56eb95cecc6bdf6584b6ca1de1

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