Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb4e00e27de7e2de…

MALICIOUS

PDF

70.2 KB Created: 2021-09-30 20:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1c49a56b49b5c4c986362797f3f19ddb SHA-1: e71128411b115d322b4fd64ae20a702e7059f0bb SHA-256: eb4e00e27de7e2defb2f0992b544ed1ffffda936d794fae39909cd64808016e8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to execute malicious code or redirect users. The PDF also functions as a link farm, pointing to multiple external URLs, some of which are hosted on compromised CMS uploads or disposable domains, suggesting an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://onlinecommerce.bg/uploads/pages/files/89099619224.pdf In PDF document text
    • http://rracc.com/file_media/file_image/file/71330243367.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/revotozufu.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/nepalifilajagagef.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150c94ec5a54---11809015005.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/vefumavapo.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/kiwipotujedil.pdfIn PDF document text
    • http://ruihuitax.com/files/file/gosoxosawininifiboxid.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/nisagixatikulumigisusibi.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/90482761715.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/43531408006.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/39975074890.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/mb1akdsvpg5rettlue5r1c9ai1/jogivozibukodajisudusezal.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/84dc59e59968a25a7c9aa0449e3feac3/5630663191.pdfIn PDF document text
    • https://solturism.ro/images/file/vival.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/8716507857.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210926054141_aplt73.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/27799609232.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/witufiv.pdfIn PDF document text
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/47363171961.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/wawepemajalom.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/zebak.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/mifar.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pafikujubatozul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=is+argon+a+metal+or+nonmetal+or+metalloidPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/60847283982.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_off0000b182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB182 10540 bytes
SHA-256: ca2b9fd3a6b87b9d2376cdebea72ad62231a7e726aaabe37d61a247318ff8689
font_01_sfnt_off0000c941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC941 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE153 16396 bytes
SHA-256: 0c50c29b1d5643798e0012853999748726d481e1e5776257638644ec4eb3750a

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