Malicious PDF — malware analysis report

Static analysis result for SHA-256 defdac6216936d3d…

MALICIOUS

PDF

73.8 KB Created: 2021-09-05 12:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 71f2342d23c2679a4e646c5d4f4e938f SHA-1: 559f418473993c652ead74bbdb61f12c0f05c2e5 SHA-256: defdac6216936d3d11bc28311d97b970ebdae352cf2da6e0d251e966f8bf0052
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a phishing lure or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://catamma.ru/uplcv?utm_term=servicenow+discovery+manual PDF link annotation
    • http://veszpremkosar.hu/_user/file/59451452558.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/15777158681.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/62084580686.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f108ef88e---xoganelatugamifap.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/baforasasevosuzos.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/89b216fb5cd5830eec7206888b631230/rugur.pdfIn PDF document text
    • https://kaimano.it/file/94007556675.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/titilijokavotoseweritiwe.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/sigenuji.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161144bc4da870---99158884415.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bf586c84907---rimedazuriloguzidumuzeti.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/b52f3d018cee8af6d4179d439b55c046/29228437392.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742f02e0799---zujako.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/36848601464.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/42887181018.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/psjhim996hn9pp5npo68aukj7s/36341581774.pdfIn PDF document text
    • http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/jatubuganumugofiluzado.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/minetonamovafenuvolaza.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/hv8jjije4c4jckrs5cn756v6a5/defirofivalezojubiru.pdfIn PDF document text
    • http://dogoxuavanay.vn/uploads/files/62673741829.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a2f8dc92e63beea8cfa95b2a94aa2754/85116316436.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/afb8f91a17e31b0c097ac1f155796713/xapozedaxugajaduv.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_off0000bf2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF2B 10876 bytes
SHA-256: a9d4faec4f401b473b20911529e58eb83df1ee2d54b307c1b2686d90efc01466
font_01_sfnt_off0000d851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD851 16136 bytes
SHA-256: 9bb318d642d3b636904d5e4c46e600e083ade9cfffdbcb5ff2dff2929d318365
font_02_sfnt_off0001018b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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