Malicious PDF — malware analysis report

Static analysis result for SHA-256 51202440ed7a4bc9…

MALICIOUS

PDF

84.9 KB Created: 2021-09-19 10:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ddb669500ee427184f9ec053961f1d4e SHA-1: 4f262f0bd33988533ebe45240012a7e5b2e49283 SHA-256: 51202440ed7a4bc9ccf76d19da190c541ed73d1d2dddb3777ab598f07c63da93
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://garglob.ru/uplcv?utm_term=the+bachelor+season+22+123movies PDF link annotation
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613096288c1c5---benuloperodaju.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/bonutuvudewufipobiluvu.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/fosoloromamonufadodopaz.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/wufetitevareba.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210906211258.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/97500828626.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/50854306610.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/12916344994.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210912071806849126.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/33298545950.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/66520361027.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/8991346250.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/12957655893.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/9009606529.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614530fe8feac---13493063704.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/dac479684d7f45903f0b75981bb7eab2/deliwajivixesiwutizi.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/60605669715.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/de3d091e01daae6c530b9dd3ad41f91f/wujixetow.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/87720022218.pdfIn PDF document text
    • http://teledirk.com/d/files/53114796975.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/kokodixipepivefemod.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/nivibunubigasimadafavunu.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/7fe21800dc9ba07223bef6b0f2760b55/85268986907.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/lelubeludogurapulojurizo.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/77103721835.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/molububeluxif.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_off0000e233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE233 18452 bytes
SHA-256: 13855bca2aae9f9c855ef0349445adc5cf4e154c3458325c40ddfff172cdfe52
font_01_sfnt_off000112c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE0 10908 bytes
SHA-256: 7a7736ad45e54585129bcd246d08b443d7c3f84d58c7f597b25a7d480927cd6c

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