Malicious PDF — malware analysis report

Static analysis result for SHA-256 70de6e6d55fa8106…

MALICIOUS

PDF

70.3 KB Created: 2021-09-12 22:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 51a6cc05adfbca1e7187c0a9bcab1615 SHA-1: f131bfe4b3ea1625704847dfb5eb90a961ab74a7 SHA-256: 70de6e6d55fa8106d2b4c9df8ad62fa37e7a0dd14ced34c89b7bff26307f556b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload storage or are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is likely used to facilitate these redirects or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=best+online+multiplayer+games+for+android+under+100mb PDF link annotation
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2f5237bb5---pitiwowupebubogix.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/24339871302.pdfIn PDF document text
    • http://grupophi.es/uploads/files/13369774244.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/pubodivexuwojo.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/80858538891.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e53b879c4b---dikedataketiwixapidovoz.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109090301187198.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/48845271887.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf299c8ab8---15239420798.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/selelazapegitebelatojed.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/zefisonujojokawezatasas.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/buvalal.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/26781474739.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/viwumijafuvesinosodin.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613721c3f06ca---guberegipisinutu.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/94227950564.pdfIn PDF document text
    • http://epmachine.ru/d/files/16733043624.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/maganozafavax.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/javokeradedavasugevejop.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/38764833442.pdfIn PDF document text
    • http://axwelindia.com/uploads/favuf.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/nefokerovi.pdfIn PDF document text
    • http://s250801404.onlinehome.fr/img/uploaded/file/farumifiwik.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_off0000b0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0DF 11424 bytes
SHA-256: 91b4096653fce90a079ae88f18c52dbb6aeb1dcb7937acbfd4cddb71b8f5df17
font_01_sfnt_off0000cb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB76 15564 bytes
SHA-256: dd6d14af1bde06703d1bed4b477fb3634e9636d0f9b5cecee580ac88a63c7a9e
font_02_sfnt_off0000f349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF349 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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