Malicious PDF — malware analysis report

Static analysis result for SHA-256 37e3ac9fe62b1817…

MALICIOUS

PDF

76.2 KB Created: 2021-09-05 06:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 095de2a12a4eeec4f9e59ea321b244f8 SHA-1: da9398b8db5935eaa83b911a4cd99ee1cab153c3 SHA-256: 37e3ac9fe62b18171e79b79ab0fe30d2885f9cef5fd229c7837e4615ebb892b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it's used to redirect users to malicious content. The presence of multiple external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/mevupalikonewaduvulo.pdf In PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8e49b0273---98240105466.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/wuwavisorotumolupix.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/fenidefujigejesidav.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/60021717412.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a14439424b---ramepowesoredu.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/90161683131.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/13992973938.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/nufoge.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/runozakumamazelik.pdfIn PDF document text
    • http://iworking.vn/uploads/files/15136350835.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/dokonegifexipodo.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210718211532.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/92931749722.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/49838206282.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/1514e9b7c8d9b667a0855cc999f791f8/27891025389.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/56bb3d117f5cbc024dfd83220e4ce483/zekiwadabiwegap.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/ii8684fjt056vc0c8ilng8ttpn/38349013296.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/rusigivarifegedikot.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/cbabd9c2c6f97a80e543088a86682678/59405543312.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/96507247622.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/5c2c0ceacb8d321e0c30a9b566e62049/26494621639.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161312101d28d1---savelajonu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=water+jet+machining+pdfPDF 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_off0000c705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC705 17004 bytes
SHA-256: 9798439297e77b5564e2373406397ffa953f145a56e0e3ac3797e740e45f2ea6
font_01_sfnt_off0000f2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CA 10856 bytes
SHA-256: cdfe5d4e0a9f04af35e4fcfc9484e611c21369b210a002365879814962aee7ee
font_02_sfnt_off00010b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1