Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfeb697cdd19df32…

MALICIOUS

PDF

86.3 KB Created: 2021-09-12 08:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 85977c5f2fa877979af098380ec06079 SHA-1: ba2670430caa0c288fa9eccbf7e77d1815b187b7 SHA-256: cfeb697cdd19df325efe70de0c19cb4acbf16d3c26e05fb17edd19e1a05a6f3c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristics indicate that this JavaScript is used to redirect users to external URLs, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://tjtvina.com/Upload/files/lutuladazuxatorisudasux.pdf In PDF document text
    • http://e-park.es/img/uploads/files/89726273790.pdfIn PDF document text
    • http://china-miyaco.com/img/file/2021911104930.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131c6dcc5476---lawuwepigananikawenovipex.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/vupidakezabiwemefuvi.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/kixowaxokoxa.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161390a224084a---32435570983.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/97154061894.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/vazufojavul.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/dorada.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/gidusetujonevoxusopuxome.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/56541383629.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/29335809228.pdfIn PDF document text
    • http://355353.ru/userfiles/file/32583442347.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/bovegofujufavuvowibasib.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbe0318359---93987471890.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109021558179532.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/jazomaxatovo.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/13014497917.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/39997186806.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/zawiburafo.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/fomokomukujuturetiwuzegi.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/dutimodukulewapokigova.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=rope+hero+apk+mod+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B4 10520 bytes
SHA-256: b600d7e82a6f9deafea4acfff459c10ae9fe4179ac73c28f890b85cb8b1acb20
font_01_sfnt_off0000ee81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10693 18016 bytes
SHA-256: 2ab44e55c16d7a821ea0a7a4ef4c251683c6e80b4ddd1cd8953646900eb9a4f4
font_03_sfnt_off000134bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BD 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878

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