Malicious PDF — malware analysis report

Static analysis result for SHA-256 5396b606450091bd…

MALICIOUS

PDF

98.4 KB Created: 2021-08-07 17:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 15043a4952545d55dd36e3b7b7d31b64 SHA-1: 3a24ffba6a7660a3afc79bfd3976cbb8e6fc4b9c SHA-256: 5396b606450091bd8213123ec1c6e5a28d371247712134ec2bd397bed51e9e4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous external links, many pointing to WordPress upload directories on various domains, suggesting a link farm designed to host or redirect to malicious content. While no scripts were explicitly extracted, the structure and heuristics suggest it's designed to lure users into clicking these links, potentially leading to phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4540d91b80---zidadanifex.pdf In PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161055a19e765e---fedafojifubijibe.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/55932104696.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160885e9e480a8---kamugin.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/26134537831.pdfIn PDF document text
    • http://darec.sk/files/files/81124431989.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5edee9f829---60472662376.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/jekewug.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ccada7863---74779064514.pdfIn PDF document text
    • https://hostingyuvasi.com/calisma2/files/uploads/87051823753.pdfIn PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/kepeg.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/pawezejameraliw.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/78c7163d9a28eb1dd548412f7d07c1a5/70426804801.pdfIn PDF document text
    • http://bhs76reunion.com/clients/e/e7/e717e6e8e39ea4daeda922698d41f3c9/File/85862611393.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d198d87e11e---sagipotuvuwuwitemurot.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d00ed447b2---sudoputunumawetixutux.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/42798667268.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5b8b8e2df---napodigo.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b561f09a7---57869832240.pdfIn PDF document text
    • https://ip-pharma.net/data/files/75507519292.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607edd2c9cfe6---nedoguwub.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/riketejojowemozexaforidox.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160841a4f1c0fb---27917260722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=hoja+de+respuestas+del+test+de+dominos+d%2748PDF 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_off00011777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11777 11096 bytes
SHA-256: e862527e45b0ae676c84936d81730dd4a31f2ec574630a71e392a5ed018b0645
font_01_sfnt_off00013147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13147 19516 bytes
SHA-256: e3ba59d88c9db6d14257268188c9f8e1be9c77d47e983b1bad76f47459b9008c
font_02_sfnt_off00016349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16349 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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