Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a5b5dffa535c087…

MALICIOUS

PDF

89.5 KB Created: 2021-06-25 19:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 13d9615da7ae5e55bbc18bf323da79a6 SHA-1: e3b499793f3b7e3017b14047937d6b41d1f4b6ed SHA-256: 1a5b5dffa535c087dc8eff683a6f598c8a485fa74651882467a837ec3c7bf18c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/732bdfe2789f7506dae5c6692b05b241/57463870426.pdf In PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/83430564273.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160777b47315d1---78741546776.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/43836971177.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/33584124169.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2274e00ac4---bojotinujobexor.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607d10ca060ab---jirasomesipelejudabu.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160805f7dce29a---85549562596.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/51060704551.pdfIn PDF document text
    • https://nadamasristorante.it/file/81631436467.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/f1ea65a5293d4f40b97ebc1412bd7085/gezebunomifawetubek.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756d3c1607b---bejasazugirivul.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8cac8c875---71568062029.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/36014746810.pdfIn PDF document text
    • http://renovator.cz/files/file/wowaderaza.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/rsav1b6j7u90t4k989g5fq7fn2/88111113200.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16074477a1e57b---xemelarow.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/36579183153.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160973b55ec336---23604063222.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875c5e9b946---75375323755.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/gitejibezadojorunivasuji.pdfIn PDF document text
    • http://fotossc.pl/_files/file/49997130495.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/79354035698.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/81510463692.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=what+do+guys+like+in+a+girls+personalityPDF 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_off0000f98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98A 16836 bytes
SHA-256: a94a4da55bb18705d654f87df427570090619072ad3610083d787463b9645e20
font_01_sfnt_off00012585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12585 10968 bytes
SHA-256: 27afe2eae1792d70f45b878195a60f82ceb809f865aa2aafab8ee4c9ee6952ee
font_02_sfnt_off00013ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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