Malicious PDF — malware analysis report

Static analysis result for SHA-256 92089e638c932dff…

MALICIOUS

PDF

71.2 KB Created: 2021-09-29 03:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 48e18992461c28577a5d55c04b10c7a1 SHA-1: e8010a31318a3d200467ca74ac91b49f96c8e163 SHA-256: 92089e638c932dff3e9a879798302ff7d297b48bcdad77172a64bf427ecf538e
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. This suggests the primary purpose is to redirect users to potentially malicious content or phishing sites, leveraging SEO tactics to appear legitimate. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://webmedcentralplus.com/userfiles/file/32558337409.pdf In PDF document text
    • http://pijntherapie.be/uploads/files/20454783520.pdfIn PDF document text
    • http://01host.ru/userfiles/files/bemajiluguporuka.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/kijezi.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613505bd542b6---woruboziwosow.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/vikubetite.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/39586867221.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/543d87e41c969313fc94b815859f71c5/30534054456.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/lafimakevurigobisutujibat.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/be9027f366dc88a3880da100e31ca7a6/latewif.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/powotixur.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/nofizexofive.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/luzaveduwasaxavikozo.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/3454626764.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/85022787565.pdfIn PDF document text
    • http://bwc.lt/i/nifobivobu.pdfIn PDF document text
    • https://petribax.com/userfiles/file/tafimidilewodugobewovawaj.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/80521726720.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/20933084854.pdfIn PDF document text
    • https://airxps.com/userfiles/files/patumawefifoxikilibuf.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/bujav.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403024589f5---dorosubuf.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/gurab.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/xinadino.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/66193607257.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+do+i+install+live+net+tv+on+my+firestickPDF 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_off0000b455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB455 15932 bytes
SHA-256: f437c1f9ce3235c1428dc09e3a1e4f1b64942d839587df00e7f9dc0217ce1553
font_01_sfnt_off0000dccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E3 10988 bytes
SHA-256: ba7df355f486708faacba2955918bb274fe90c44ec3b177ce8cd4cb41ecc00e3

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