Malicious PDF — malware analysis report

Static analysis result for SHA-256 cce8c169bb4ab1fb…

MALICIOUS

PDF

81.0 KB Created: 2021-09-15 22:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6bfccb25774cb02328b2a3251c8a6886 SHA-1: 86c0332d3f7d58955961dfa8f20dff32eec890fb SHA-256: cce8c169bb4ab1fbb468ca65eabbc9cd8aac23dcd9fa6197282023c7a88dcba8
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests it points to compromised WordPress sites. These findings, combined with the ML classifier and ClamAV detection, strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • 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://etadelloro.it/images/file/6152137844.pdf In PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613beeffa9799---55932322373.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/dojogofuke.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/ef560c052bb8a843e9025ad3d77ab6cc/27094468750.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/c7a8ea245de798cfcb10ba91fe7008cd/fafukudeluxa.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/gamudomudawugexuxisebe.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/3cd55a5d7f17c7c2f12fbeba297f4c71/tiladotadipuj.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/zematepijunadedikogejut.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210916015423.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/rikepol.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/69128455193.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/vabakonilesukelemi.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/26449817256.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/95053230767.pdfIn PDF document text
    • http://carbontuning.ru/file/73997696759.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/rixozazodawegavarad.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/77317897225.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/miwolelisof.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/luwox.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/munamukoxujorerenedobu.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/lufowaduginemusa.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/255469102.pdfIn PDF document text
    • http://budka39.ru/files/19507152374.pdfIn PDF document text
    • http://thepducphat.com/upload/files/pidixotikifesufaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=device+id+changer+pro+apk+no+rootPDF 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_off0000d5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B7 18420 bytes
SHA-256: 1c6c658dc7c001d8198a89aa9d11107a6b0f4092cd21931ccef6814b2392dff9
font_01_sfnt_off00010622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10622 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E39 10736 bytes
SHA-256: dfc3b64e02882c4318c142ed8a19b06597641937f89fdb8e35aa0df8a1430796

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