Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb56ffe689320854…

MALICIOUS

PDF

70.7 KB Created: 2021-09-10 20:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c64cb72d09250874e84545d4ceb7c362 SHA-1: e1b36031ccced120442130c531ba9ed9e2a861dc SHA-256: fb56ffe6893208543ee35b27cb8b078dd8939fb1b5349711d3620e6811007e11
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, indicating a likely phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7446

Heuristics 6

  • 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
  • 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://synerhu.ru/uplcv?utm_term=how+to+check+battery+life+of+airpods+on+android PDF link annotation
    • http://gomsuhoangminh.com/app/webroot/uploads/files/bobaxaniritaxuxewanaru.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/zabifoxonilibubisigapused.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/19309586654.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/83037726967.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210903_A8DE5AD0F1F7E3F0.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/wemudeveturalovonepe.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/19071471167.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161393ddb28271---goxefubasubesanep.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/9413a200d022c50134ce3d657091f9ea/5856558987.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/dofutopedoxadugim.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/kabis.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/gesaw.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/pokonaxupi.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/xoxujemarep.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/16d3f431d1e8b308be9ce9f8cae3e08a/tofeviloxotisimebigive.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/jotawijirozoxufodifif.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327da56fe67---3066539504.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC377 11140 bytes
SHA-256: 0c770a9aaa7de4ffdd2e37bdbc76449cab3d2b8b18749ed0d3efe49d6c5fdc02
font_01_sfnt_off0000dd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD39 18032 bytes
SHA-256: 3c8bdefeaaf23b92ab3a30f03a826ed42c65448592a492dff817f6aae4876a5f

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