Malicious PDF — malware analysis report

Static analysis result for SHA-256 626d8ad7252f66e5…

MALICIOUS

PDF

75.5 KB Created: 2021-06-06 00:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 3fa761d665a4f39f00fa6e8dd4a9f40e SHA-1: 803b4e5ed0d7638386992ad8cb0465ba98a3b566 SHA-256: 626d8ad7252f66e59b56b741cc72dd5843aa876c3c30edc7a123f61583ea5b91
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting it is part of a phishing or malware distribution campaign. The presence of a 'download button' lure further supports the conclusion that the document is designed to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=employment+verification+form+template+word PDF link annotation
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608020a420e05---vufopabobeta.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16079d2ac9d8b1---41555939684.pdfIn PDF document text
    • http://physiotherapy-warwickshire.com/user_file/file/favugeketanagatipet.pdfIn PDF document text
    • http://lucann.com/Upload/file/8729112690.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da2bae8730---jewogaxadipimobex.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/55720827441.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/7393682502b6fcd894745ac15ca67281/zozowujuvabokuroluwuto.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/4da09517d373225974da2c98d5bdccf1/gupobuwevowo.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/44f05bfe189a8e6f9d1cb8a5a525bbb2/49714128274.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/d0fa5542dd5b5591ae1dfea2bab0abd1/40486925165.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c4df1c11b---7991553064.pdfIn PDF document text
    • https://areicon.com/images/file/niwaxifajokad.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/231d286d0f40e2a7c916b45155547b79/kudarezava.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad48d99bd9---38055145829.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a4c60fdb9cf5fcaf72e438a6fb5fa0de/vuvexapukoluxawuguridi.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bc791f7f5---bokiviwujajifegitilod.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b9dcfb4c3b9---72661786334.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000106d6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x106D6 16888 bytes
SHA-256: 6b8a8f1ee99908c72bf0ccf71ed4252fc2e97ce2e8b58bd24fc32fdae0f65875
font_00_sfnt_off0000d128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD128 5332 bytes
SHA-256: 8a84248d8ddd897f62a0ce9fee6622df09ccef56546ddf0d0ceb23b00525b974
font_01_sfnt_off0000e35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35A 10324 bytes
SHA-256: abdb1ab9b111fef027333dc94780fbcb66e399bedcef097c317eb61540666270

Open this report in the interactive analyzer, or submit your own file for analysis.