Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c529d4029d354ad…

MALICIOUS

PDF

80.7 KB Created: 2021-09-21 01:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b46f8f6c87320387c8d37669fdb114c2 SHA-1: d029a5c7ec76ed9285f57ee360fd1dc6b38b4ea6 SHA-256: 9c529d4029d354ad814f60035b56481f1ce71d4be3e8e573d89be8e9edf5c1ee
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt.

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://extrastyle.ee/ckfinder/userfiles/files/78214792290.pdf In PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/8760016648.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/32567557221.pdfIn PDF document text
    • http://highdesertrent.com/newsite/images/uploads/file/11279198099.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/vediwekonuruzefumokeseli.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/modazurebewajamogo.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147d7284c557---78296126140.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/24842187224.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfe94c8232---46532550179.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/vexobuxopalunebagu.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/dikexofopilewalev.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/dexitidoxiwimikopefita.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/38718242080.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/rinuvefezimo.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161432b0c5852d---wovadejovipasugakipu.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/2991701879.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/50450021039.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/67895165492.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/37628936820.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/ginovafolifelesuxi.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/labikexerifujokimaziv.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/gabakimekekumexiwonu.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/86665206437.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/bakewejudamukipob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=gamraj+comics+downloadPDF 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_off0000d7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DF 17212 bytes
SHA-256: ae9c1c546a116c1ea571aaa60f241ef8299f534fff2085e0504c9b103db6ae9f
font_01_sfnt_off00010521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10521 10556 bytes
SHA-256: a45337d03e9f3709ab7ca144c8235c3eec18adeaf3e83e9598b215bb6363e089
font_02_sfnt_off00011d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1