Malicious PDF — malware analysis report

Static analysis result for SHA-256 489a6fe6d4cb2337…

MALICIOUS

PDF

85.6 KB Created: 2021-09-05 20:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1ea7340fd107bfb5a69bd65934166139 SHA-1: 00052e0787b500b69fd593ca60de659063a0a378 SHA-256: 489a6fe6d4cb23379e8b906bc880c53befaf931d3549f4b382a14d539bec832a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This pattern suggests a phishing or malware distribution campaign where users are lured to click on links that lead to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

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 http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a67b7a304---lubuluje.pdf In PDF document text
    • https://comptables-publics.fr/userfiles/file/wuvaxolevidomapox.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/zonevexuvusimufidix.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/8b68f47d052397bbe648a629fabc2352/93288559240.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/fasasiditiralobuzovumobu.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d07978ff92---powotawakenik.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5046461a3---59254403162.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/sovelobepegak.pdfIn PDF document text
    • http://lagrupacio.cat/file/78764675860.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/79fee7ec91191611754c0efd502880e0/37361293150.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/35596701752.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/40624671741.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/57666076020.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/boxixirebepotuwolovi.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/vugosebuforen.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a48dd7644ea---59987074656.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/sefaxikesejesibigolu.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/korenemefakuzimulan.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/17171653861.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/gavuwo.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac4b5ab4b5---21388178223.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e2453f405---50528031972.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=mycoplasma+haemofelis+in+cats+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_off0000ecad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAD 16576 bytes
SHA-256: e0c9d57ff21d70fc2d3d7a103d55cda9ae3adc02bddfd7f06a2191ab6b42997f
font_01_sfnt_off00011762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11762 10892 bytes
SHA-256: d8bfae66f70a9336c2c5eefa25a90bdaa4d671e8bd1502a2033644ca59110b25
font_02_sfnt_off0001306c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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