Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8fcf43fc687675b…

MALICIOUS

PDF

80.7 KB Created: 2021-09-10 02:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6f0378a7f9a95c9c4600f22037f3bc4e SHA-1: 47b9adea7be6f0f09cf6579bb9f935b568d01396 SHA-256: c8fcf43fc687675bff01f5f66dbb99e815c7a80b3e4283da0b6302696e74c605
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to external resources, with several heuristics indicating a link farm structure. The presence of 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests an attempt to distribute malicious content or phish users. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely involving the exploitation of vulnerabilities or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://newtrichur.com/userfiles/file/gabudi.pdf In PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210901_561F7F2366342EEA.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/49969055992.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613283e176810---kekopel.pdfIn PDF document text
    • http://hnht-electromagnet.com/d/files/resoborudoda.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/xesanakefazukonirizum.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/39700520798.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/migadirativumi.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/44755284619.pdfIn PDF document text
    • https://5udua.com/contents/files/xipokepirokiwekan.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210906040440.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/zutososukifo.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613637b6c4b1f---kosigoborawatexem.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/bovulaxali.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/70828771693.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/tidesubopifazorejitewu.pdfIn PDF document text
    • https://heureka-cz.eu/files/76376014521.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/31011340782.pdfIn PDF document text
    • http://fruitvita.com/files/files/jilewesepu.pdfIn PDF document text
    • https://eventaipei.com/upload/files/xotowaruredoxovet.pdfIn PDF document text
    • https://ivanamihic.com/files/mexoxovoxubu.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/wenizuzarapu.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/zuzeduwosupejowesimojig.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613528d07a3ba---49930452850.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=download+game+naruto+vs+bleach+mugen+apkPDF 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_off0000d67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67E 16852 bytes
SHA-256: f5fbb8dcbc571b051747885ff8d43a10126d01ab25818d63c1ea86653d87c665
font_01_sfnt_off000101f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A09 11356 bytes
SHA-256: 5e4cb455d69077b9c17ca503a32052d56f71fbc46266e052f68e7d449561c02d

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