Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c948ddfd33b09d0…

MALICIOUS

PDF

71.6 KB Created: 2021-09-24 21:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e6f1d9c0bef2ad1fbb2de04207e1c51b SHA-1: 5d099d4669ffe95f84014723648d4c1aaf6a1fcd SHA-256: 8c948ddfd33b09d096662d6c95ae0be15d67fa4ddc45136bb945d1c2c7edc800
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are identified as a link farm pointing to compromised WordPress uploads or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://nomylo.ru/uplcv?utm_term=google+calendar+for+android+wear PDF link annotation
    • http://tahyuh.com/uploads/files/202109092353121290.pdfIn PDF document text
    • http://shesob.com/file/files/57767906887.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/jowufotexobuguwunuxugomep.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/60569970470.pdfIn PDF document text
    • http://mopron.ru/upload/files/83763212899.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/161491357014d2---vajonatagusadizanowivokep.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/jozenevuwupol.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/84797040628.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/57761183310.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/zapiwej.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/45014352940.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/18222681040.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/20219202330558846.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/96854591959.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384c3054159---bogenupejuvereti.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/c0d98b53b6cc29b69b2a7c945121b928/26812339539.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/siwufagebotuwulafu.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/sopitaxefabewazadeduj.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/sukedazorelogijisuju.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/90201079988.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/15093241480.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/91660187041.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/75522686807.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_off0000b694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB694 16588 bytes
SHA-256: c3fec7eb2d58eacb9ef05b2d7ee1ba9e3bd9e24ccf0ce1fc706a027166c1bdc8
font_01_sfnt_off0000e0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90D 10508 bytes
SHA-256: 3b0b6ba75a94858a1dad27a5790c88d94028381e203ca232ed487254696633e4

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