Malicious PDF — malware analysis report

Static analysis result for SHA-256 888c741de76411af…

MALICIOUS

PDF

79.3 KB Created: 2021-09-19 03:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: df0dec1e90c53dfd84c82b259ffd6da7 SHA-1: efbcdc2c870d88705b1e26061843e5e166a8620b SHA-256: 888c741de76411af7f12b34b9c77af005534aff60d98f9b54b038655201e9e5b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://drafthe.ru/uplcv?utm_term=call+me+a+legend+apk PDF link annotation
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/jtommra25a9ah2dlop02hdv7sc/99085345128.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/14788235580.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/witiwegogakif.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354e647f332---fonazitubirabetazesox.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/66889368687.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/nategabarasuliroribupa.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/povowakuzavoj.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/goxelali.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/jeperoveruwol.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/41241704131.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/xumokekaxajuk.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/16453721707.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/9287222297.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/nexanafonura.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/55054911066.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210912_223307.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/55751230983.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/pokijozaxomuxevasej.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/pebesojomef.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/mhtg455rii6gq8unnh6tk1j9l2/61713391083.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/91044676999.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/20593505043.pdfIn PDF document text
    • http://indel.sk/userfiles/file/gilukumamurir.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/mazatokofijo.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/jexurigo.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_off0000d434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD434 10280 bytes
SHA-256: e82c162b8e21ce4c94d21972bd5e1d451c5e20861abb5eeec631cdc91e5587f5
font_01_sfnt_off0000eb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0C 17428 bytes
SHA-256: c727a7501a5100f217b00b401742d97eaec8269b0dbd2e024432b1310413f1ac
font_02_sfnt_off00011811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11811 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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