Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b6a7781e3e1151…

MALICIOUS

PDF

63.7 KB Created: 2021-09-10 09:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9cbd7c2ff67b6623bc617e52b41b9604 SHA-1: 97219dda089eadadb6a06e522fd46a5cfcb7d8cf SHA-256: d4b6a7781e3e11519aefd07bec904b57837f518e52020a2e349775865f55dd89
94 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting a tactic to manipulate search engine rankings or distribute malicious content. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5438

Heuristics 4

  • 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
  • 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://birutelorasin.com/contents/files/pifagin.pdf In PDF document text
    • http://patroha.hu/file/baxulileri.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/13580092885.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/51256610810.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/11387868385.pdfIn PDF document text
    • http://rld-carbon.com/file/63471220770.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16134410a2a05b---71286836278.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/780c86f4130f7250fb0d8cae77f5e7ea/komejoxokoxufu.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/64603862399.pdfIn PDF document text
    • https://bdata.vn/upload/files/85766549760.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/bibiru.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/vosakajuwopipav.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/69828015678.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/pupanukip.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134343ff2a34---26341081284.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/zerofokana.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/zupag.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/tusepeviterarerenubenokip.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397dff9747e---49075107794.pdfIn PDF document text
    • https://digireg.ch/upload/daniwixavemuvifoginiv.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/13747794043.pdfIn PDF document text
    • http://espwireless.net/uploads/file/42967138169.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/15376539210.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/xuxere.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/51713621794.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/powuwupidisekaxisi.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/pozaropuxukojokapop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=iphone+to+android+image+transferPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B7 10848 bytes
SHA-256: 0c3e56d83fcd0f116add22de8d43b759950a593b1eabe9257fccdb492354e692

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