Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba274f9f36a6875…

MALICIOUS

PDF

79.6 KB Created: 2021-09-20 08:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8af75ffff4fdf9a6552cb3854ef888bf SHA-1: 13c54db7443349bbcd4e3dae2dadf548161f714c SHA-256: 4ba274f9f36a6875c36796effac8e798a5a6cb9df6866ee3b0f4433b28ce4cb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads and disposable domains. The document body is unreadable, but the presence of numerous links and the heuristic findings strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • 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://xn----8sbnbd9chja.xn--p1ai/userfiles/file/52514834903.pdf In PDF document text
    • http://tubesealer.com/uploaded/file/5635193786137f052a6658.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/22844905813.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/nejomawafulozetumafor.pdfIn PDF document text
    • http://homeopathyhk.com/files/zimod.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/33214950872.pdfIn PDF document text
    • http://xueyuan.zlyxgw.com/uploads/ckeditor/files/20210917045235.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393132b8795---29751904302.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/wedifoboditomi.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210916_89DB3F22010D7AB2.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210914073307.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/datorunapajekaluvubusi.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/46226237937.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/rejepipelogaguluvivisem.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/88162636538.pdfIn PDF document text
    • http://wohntraumgmbh.at/kelewiruji.pdfIn PDF document text
    • https://mfdesign.hu/files/file/17941578145.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/zulebezuteb.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/16212563973.pdfIn PDF document text
    • https://maymac.info/userfiles/file/lazejafotukemi.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/medupitawitozaronozo.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161336178c4fc0---49960396261.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/gibipufonagorifaninorove.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161443a27c289e---28749657986.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=circle+ripple+animation+androidPDF 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_off0000d177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD177 10536 bytes
SHA-256: f02c7afd76cc23d48962edae47676cd9e9948d43b44bbd8ed82144a15f1d2fda
font_01_sfnt_off0000e963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE963 18220 bytes
SHA-256: c7a1b1d02ddca654c3506410adb906b3a70e58a1e29eddb310f4e3f6361c7de4
font_02_sfnt_off000118b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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