Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e0eea6ecec0426…

MALICIOUS

PDF

89.7 KB Created: 2021-09-15 11:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 93364151e1cc417375d1bd77ccc448be SHA-1: bb1e50b04136df9bf37f582769fbb493a8e38385 SHA-256: 91e0eea6ecec0426d9c5c0f723873e658cffece830d5061783ca0df6101b00be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and a link farm pointing to multiple domains, some of which are hosted on compromised WordPress sites. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely for downloading additional payloads or redirecting the user to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://sirindhorn.net/upload/File/76915310822.pdf In PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/potazirokarixepibus.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/10537545310.pdfIn PDF document text
    • https://hoangphatdanang.xetnghiemadndanang.com/uploads/image/files/futijakawidoke.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/3430783578.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414d8952771---dusupikakixitomapuduxivat.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/20129916799.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0abca86dd---gijaraze.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/37204185255.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/nezugazonikisobemetole.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/87672584473.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/53291198919.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c6697c1211f58cdcc2ae1b7eb21fd728/127456805.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/fabupemipigirofojipirijis.pdfIn PDF document text
    • http://lex.tj/img/file/tixuziziwivelowukuwi.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/39035825568.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/a8ca1dc9f9b15fe6ab6b65e15ea5441d/34494894975.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/jogaworupelejup.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/metuduzujobipajaziri.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/wewipefujigozavu.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/rogis.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/88250525171.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/tibozowipepupasodugoxalis.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-4/20210904083348840075.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/17424440245.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/qmblgbbjodmkjpaitn9u0annh0/biziwifelizesovediwir.pdfIn PDF document text
    • http://dfanchem.com/upload/files/2816321937.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=attack+on+titan+android+offlinePDF 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_off0000fb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11386 10372 bytes
SHA-256: db902af6dc953b7a03239dec77a234c49369ed9015e63623dc1e35e81974af5f
font_02_sfnt_off00012b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B22 17432 bytes
SHA-256: f3d22c6aed13318d90b17b3dead9267cc99141092af51b07e9797a3b90f2e905