Malicious PDF — malware analysis report

Static analysis result for SHA-256 edee859092820d55…

MALICIOUS

PDF

77.8 KB Created: 2021-09-20 19:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 71bcf4bf530a2286a63d0e07334c7eee SHA-1: 79970eee28734eb4cf3ebe9616b942c338ebad4e SHA-256: edee859092820d5541d6c9063b003dffe5288a9b2181e5daef9409bae284f925
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of links pointing to disposable hosting, indicating an attempt to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://platcometals.com/images/file/66713739680.pdf In PDF document text
    • http://jenan.com/ckfinder/userfiles/files/46971143052.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/672657299.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/sadotexe.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/disimelo.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/15147744908.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109202105289415.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/28676407222.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/9577d4cba1186a03572ddfd6dc5b4920/letolevawefogogofupapoli.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/xamari.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7bce85aad---71128339964.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/wewuxazufamikirilevur.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/sikibiluwusefof.pdfIn PDF document text
    • http://104408017.linker.tw/files/givajusafigitawenaj.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137345fbb0a9---sadetap.pdfIn PDF document text
    • http://unleadedcoffee.cz/soubory/38337141257.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/povemopanukatenapexaximar.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/tiwinuxiponaniz.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/saminikudeni.pdfIn PDF document text
    • https://comfort8889.com/upload/files/80787594620.pdfIn PDF document text
    • https://esvigo.com/upload/files/63627045204.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109191632165163.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/72960589259.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/sowogigexopimikuv.pdfIn PDF document text
    • https://empresa-venta.hr/files/mikesexinut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=download+novel+the+devil+husband+pdf+zenny+arieffkaPDF 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_off0000c884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC884 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE096 17656 bytes
SHA-256: f80341c41d5627b0a83b384a3a2be5426e119de50c86997006089de087afe78b
font_02_sfnt_off00010e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E58 11252 bytes
SHA-256: ad73714d90cee1856723b84edece807d10a8a3e2c3cb44aab3665ec4c2cf3ea9