Malicious PDF — malware analysis report

Static analysis result for SHA-256 9521a3a57e7f68c1…

MALICIOUS

PDF

83.8 KB Created: 2021-09-14 01:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e97090cbd2fab11dcd0b62c8f7d12713 SHA-1: a34c954b01a58c36c07e2fbeb012e6448a8c67dc SHA-256: 9521a3a57e7f68c13b1850db392e48b83d45f085627bb2d75619bf747d373d84
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains. The embedded JavaScript likely facilitates the redirection to these malicious sites, serving as a lure for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=how+do+i+install+an+sd+card PDF link annotation
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/7516ff823bb5c951d2452c426e054b2c/70843324503.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/nujofudizo.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/60307604850.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/lirezimegiziwinob.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/vunewebinege.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f061ca446---71235541622.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/tojotakelolajitew.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/xakeboxivezajogago.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/bixikuzobiridatugovubuve.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/sezufigibegaxonaga.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/lumejiz.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/xudoxotinibi.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/44018936383.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/84981217732.pdfIn PDF document text
    • https://agatanorek.com/files/file/80146024625.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613044ea88a63---39794879033.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/63076984116.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/xinaw.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/zezelomi.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/fevamewovuvuvelipurebereb.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a7104c42e---zolol.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/mekeb.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/larejoxotexinatota.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_off0000e255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE255 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA67 18344 bytes
SHA-256: b58df9550ba4726b9011b03599a61f1b88250bb49aeae3f1cf7613c10a454a81
font_02_sfnt_off00012a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3B 10308 bytes
SHA-256: 92580691f54256d9cbd7a1ac4fac6c195c97fb5d2bf8d9f587caf4907ddc8cfe

Open this report in the interactive analyzer, or submit your own file for analysis.