Malicious PDF — malware analysis report

Static analysis result for SHA-256 231b23229a542ff1…

MALICIOUS

PDF

87.3 KB Created: 2021-07-17 00:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2cc8842f5e6fa80c40d861e14136ff88 SHA-1: 8d1b7ce3db1e3d563778ae446a2087e369511f57 SHA-256: 231b23229a542ff1f4d0dbc28091128fe74e279c6f5963b471ef61b0e527430c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to potentially harmful content. The embedded URLs, while some are marked benign, contribute to the overall pattern of external redirection.

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.isgs.org/wp-content/plugins/super-forms/uploads/php/files/5be4bc4a8760f015fab17abd1874b631/91572122939.pdf In PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/80541364159.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/palenixelazemigisutis.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/d3dcd051ec52fdfecc464565d7e9d964/dajobogarakogevuwuv.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/35532776933.pdfIn PDF document text
    • https://tipresentoio.it/images/file/zirudebomilonolivewuduke.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4vd0kka3755nd9pura0q634um5/gexazimaxapawutorutoxevaf.pdfIn PDF document text
    • https://la-klamm.org/Files/files/kefema.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a704f079f9d---97486189376.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/fawijelutokareputurudipog.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/dca4bd8de884af4e35d1587f936590f2/fodurisas.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/tubckq5pcqqs0bl251hjv58to3/11664473410.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/3ca4e562fcc072e9b1da63028d2d400b/nepilena.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c77158e492b---59870082799.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/76674765988.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/vovelezanixonixobofipipo.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/37729650101.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cded1e1d1b---zamadote.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/vuvekuvutipule.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/09cc6795040943b244e3a7902fa081a8/fizunalomoxe.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5fa010081---43220377129.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bfeb89ddd---66134234109.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607da1fc6902c---68850884280.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/a6e8680740dca7c74dccc3d30df6b0b2/18868444727.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=black+female+professional+tennis+playersPDF 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_off0000f216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF216 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2D 10900 bytes
SHA-256: 2ff3c6ad73833f30edb95d2b8fbcfd8b8c5d7c353b282d23423b1f54398e47fa
font_02_sfnt_off00012371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12371 17364 bytes
SHA-256: 9dd3d8ff24487bcdd999d6c15fad5e8a9526327f14aadf1b50869ba7d57a3904

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