Malicious PDF — malware analysis report

Static analysis result for SHA-256 e725cdd6c20dceed…

MALICIOUS

PDF

78.0 KB Created: 2021-09-10 03:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f0407e363dec54acc687a726a4cd9b88 SHA-1: 71838e61bd44f5ded1aaabaf03ea7c18d03924e4 SHA-256: e725cdd6c20dceed021c85fd11705587a04e5bc55d4d8699680d493838139fdc
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the nature of the heuristics indicate an attempt to lure users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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://ximangsongthao.com/app/webroot/uploads/files/jufawudiwase.pdf In PDF document text
    • http://stelmart.ru/userfiles/file/13886453963.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/61a82f56eeda8f7bff3ab9b9029776fb/41707873096.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/pibewuloru.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/37557409712.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/1426928618.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/94968768180.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/lobepe.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370433a1165---48487929879.pdfIn PDF document text
    • http://image.dlib.vn/libedu/news/bachviet/20210909/file/zebasemogesiz.pdfIn PDF document text
    • http://186086.com/upload/files/wozuwuxoradabevidenate.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/95680957928.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/51093823996.pdfIn PDF document text
    • http://gnox.vn/upload/files/76727792009.pdfIn PDF document text
    • https://razredna-nastava.net/files/57820449824.pdfIn PDF document text
    • https://fptica.ru/images/file/4390827706.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/82805499012.pdfIn PDF document text
    • http://robbes.nl/media/files/bifulix.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210902_233842.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/39046322874.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/fizoxepoxese.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613054c201969---pubirogisiwuzopuvepim.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16137e22290f3e---16348369310.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309730a79b2---sikidax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=radius+of+elements+in+periodic+tablePDF 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_off0000cc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC43 11064 bytes
SHA-256: 8ee34c30d3af727f16660efec61555a6e3f4a6886c51bfc7eb4e74d89b42bf4b
font_01_sfnt_off0000e5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C1 17268 bytes
SHA-256: 7b2fa493c0b183f9ab054b0294a7de738e35b83a08b2350c73162465cc00dc36
font_02_sfnt_off00011247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11247 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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