Malicious PDF — malware analysis report

Static analysis result for SHA-256 09f3763de0beab99…

MALICIOUS

PDF

85.9 KB Created: 2021-09-10 09:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 446175e295a95324724519013076c856 SHA-1: 97e7118f859b57d841ec751065921824b0d2f882 SHA-256: 09f3763de0beab99f7fa3e940a58bfb4ee9401809904f609942513385cc7805f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to PDF files hosted on disposable or potentially compromised domains. This structure strongly suggests a link farm designed to distribute further malware or phishing content, aligning with the ClamAV detection of Pdf.Phishing.Trojan. The embedded JavaScript likely facilitates the redirection or download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://garglob.ru/uplcv?utm_term=watch2gether+app+android PDF link annotation
    • http://stringladies.cz/userfiles/269060862.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/59707697105.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae49010669---20442609962.pdfIn PDF document text
    • http://krzeptowski.pl/file/zusopaxanawilekusakajugu.pdfIn PDF document text
    • http://gro-felix.si/uploads/61251069424.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/ragiwi.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/97015261369.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/42446088248.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/46163776928.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/xajuxid.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613394e4449ef---57362198718.pdfIn PDF document text
    • http://sakem.org/userfiles/files/xosasiwatedotonudazerer.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/balexudetuvav.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/92254599919.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161348520344ec---fokuxiguvuvomanunodoz.pdfIn PDF document text
    • http://myphamvickwhitebeck.vn/luutru/files/39323683312.pdfIn PDF document text
    • http://carbonelite.ru/file/56276609614.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f14350396d---bapowaga.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/kixevugu.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/49334702165.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/lurawujawopodadoxo.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/xaxosurofewito.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/63833226618.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_off0000ed2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001053d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053D 17328 bytes
SHA-256: 675a84f5c8daa39f4c2c017a3edc62ed1982ec677c04003fab2f9a639a61ea55
font_02_sfnt_off000131c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C3 10692 bytes
SHA-256: 96e8b4d402a7b79ef3c384b51d8e2c16eb2db04a0d0627eea208ecb1835db654