Malicious PDF — malware analysis report

Static analysis result for SHA-256 e43a3e2815a8d3f4…

MALICIOUS

PDF

80.7 KB Created: 2021-09-07 06:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6332e3bc71a66ad9b8e11fb3e57a10e8 SHA-1: e423709e5d15abbcc8aa5f1c650c50aa93714ec1 SHA-256: e43a3e2815a8d3f4ee04b645dbf62557016189d13360cba21da57d1422824a2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings further supports this, indicating a tactic to obscure the true destination or leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126b7c26db84---96916273607.pdf In PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/lakimopimapojev.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/ed1b695969392c884553b864f959be24/48215379665.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/forisugevaj.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16092edb9abb3a---47355742451.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/88454808733.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/liwenuvalumopiga.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d0a27f686---49618769509.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/megaleg.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/b093eca3e773bfc75f67de5d614e6128/80453064231.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0e9c79a7eb---suruxuzi.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5ca73ca12---sowetesebabadexutetadu.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/revafupawukimuvitigoxaxe.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/58084fbb63ac9e50d712eb6f61abf570/dejajanevobimofiwi.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/34793450781.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/pelovurixov.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/53877098700.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/d2a95e71df02412842c9597316c0e39f/16935014927.pdfIn PDF document text
    • http://vipdiler.ru/files/file/10165290579.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/dutamutejavivezuwum.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/81575074858.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/60584108269.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1bd29ca5b---labefukasipuk.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/68693297684.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1323983832611be3e8cbf71.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=radiometry+book+pdfPDF 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_off0000d8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10A 10732 bytes
SHA-256: 3c46f94725f46825b3d630d70288695e14dc59bf23885a595e938be4ab1d716c
font_02_sfnt_off00010985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10985 16872 bytes
SHA-256: 85182392a999009c678eb7b442cce001e98129ef86b931e280fc1ca63d037cbc

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