Malicious PDF — malware analysis report

Static analysis result for SHA-256 4657cdf2a6e5d150…

MALICIOUS

PDF

83.5 KB Created: 2021-09-06 16:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 745f3ba0af566978d58daf32be589ffd SHA-1: fa96e1277cda5c99127987d44cedbdd995ab72e2 SHA-256: 4657cdf2a6e5d150a39abf4c81eed7ef2f28676cdd13f505db39a4461d76831b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document impersonates a cloud file-sharing service, a common lure for phishing or malware delivery. Multiple heuristics indicate a link farm pointing to potentially compromised websites, and ClamAV detected it as a phishing trojan. The embedded URLs suggest the document is designed to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://queure.ru/uplcv?utm_term=split+pdf+file+app PDF link annotation
    • http://grawerlik.pl/userfiles/file/78909993065.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34b366b27c---ruzoporutigila.pdfIn PDF document text
    • http://sunnysideclassof64.com/clients/a/ac/acc4ccb49d7935ca36198347b895393e/File/kegugodutifas.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/49263439913.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e7b8a909a0---lokifusizixuxo.pdfIn PDF document text
    • https://airbays.com/userfiles/file/kilijimorutezod.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/31385893456.pdfIn PDF document text
    • https://mimpishio2bet.net/contents//files/80501604972.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/fimulemebasegomin.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/37734447715.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f36be0845---79458701231.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/ed47b51d26c255a806c26d13ad9fa695/24645786539.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609432dfd74de---67292227772.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/74911320634.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/iq2mgfdo5moaq43abiq67i7js6/sitag.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcc1d09c1b---xenomiveguzefi.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160981c4f533ab---78165690172.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/11292401233.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160723c024643e---dividisanex.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160782ea11846f---86350822788.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/5a521bae9a7f6bb85dc163b654f7b687/35864936455.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/62340516434.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/5tetk4g0asnvo4ifbul2ve3ed1/80608438461.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/guwopida.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/8695424405.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/59f8d261645ce8526bff1835969e302a/75424254156.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/29466347607.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_off0000e454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE454 10072 bytes
SHA-256: 947bc03426ea6d0e1c60466ef5273bfdb10ba0c37ce2be46d6b4a8a5ec142ea2
font_01_sfnt_off0000fadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADC 17832 bytes
SHA-256: 5a871b8d774932407efe56fcd61bf2e9af106f174f0017c64bff8c46e774bb22
font_02_sfnt_off00012888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12888 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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