Malicious PDF — malware analysis report

Static analysis result for SHA-256 56b5c5d53ed4206c…

MALICIOUS

PDF

93.1 KB Created: 2021-07-24 06:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 80b99c694fea529eaf836318e42dd43d SHA-1: eafbd887f53525ad6b54c0e44cff86cf1c3c7ace SHA-256: 56b5c5d53ed4206ceac14b78e9ae2212b264e2ea87a0ed39a6f5622b386e2703
176 Risk Score

Malware Insights

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

The sample is a PDF that impersonates a cloud document-sharing service, a common lure for phishing or malware distribution. It contains numerous links to potentially compromised WordPress sites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation or the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608502fa9fdfe---famibivedugozow.pdf In PDF document text
    • https://lesfeesdelhetre.fr/upload/files/xifajosivedo.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/71184122960.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/gulotaneladumiluvixuz.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dc795f81c8d---60228030564.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd75fa30de---98015891749.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/0f2a8b5ec1b9a5c31a8ba37eb7f19004/53411714459.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/wuruvexobutag.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/tigadofesuzobebuxob.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bcffd1ba898---wazukojuvajoxigoxifakeg.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/netukosizalojofuvufekon.pdfIn PDF document text
    • https://ckmandarin.com/uploads/17657576641.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/wavoxug.pdfIn PDF document text
    • http://s-moonlight.com/CKEdit/upload/files/ronatuzeloromagevulaj.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/f6b5ee98e76509cc7ccfb16d9b74f489/46291680635.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/5dfe788f3e7f85acfa61db3e6d13f2e7/25817789234.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/889d70c55c8b15149784cb564f3dcca1/wivase.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/949b857726311c80c5708162ed497322/9284805372.pdfIn PDF document text
    • http://praguetransfer.com/files/file/97084416515.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/zilog.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a8244158fe3---87549888927.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806aff09dd3---lijitirurew.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/0b87877bb81442d798c4ebea921b1b00/11629762985.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=after+we+collided+book+google+drivePDF 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_off0001049e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB0 18296 bytes
SHA-256: 21c347807400329de2121e6a30a19a02bea2976df3dcb3fa8afc0756b07a779d
font_02_sfnt_off00014c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C36 10580 bytes
SHA-256: 2c4019b3f37b3b1279c19ae4b54781b10e3f749910b44e08f45c2865349ed41b

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