Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef95119c1190601…

MALICIOUS

PDF

253.2 KB Created: 2021-06-19 23:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 4d6e56667e15f5ad2257eb7ce1753faa SHA-1: 6466dbe730ebabc512dedf6ed5d820e6ba7dd223 SHA-256: 5ef95119c119060118917f2713656d4f3c5db4f6f0a2bb2d7bc4741d37c848e2
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to compromised WordPress upload directories, a common technique for hosting phishing pages or malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing a secondary payload. The document body is heavily obfuscated and contains no readable text, making it difficult to determine the exact lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/a2eaf5764ff4cdba2b9885e24cde7213/28825829795.pdf In PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ios0cbti8s2496qtg2l01kjv26/48233805524.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/75694406370.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2ea1dd3a4f2922ebe1140d9f7646771e/96818508281.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0561b7da7a---xebikefixoratuvuvaxi.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/5e683fc09f03d350e52d5d8764482b01/vapofokamo.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607278b19079f---53963959085.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcfcb06725---taletuvodopufemovavubub.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/k6svb3h0h7b4nm6f7jgbs8vrb4/35188931690.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/gejuxufupibopetemise.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/migadunuv.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/gatuz.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/830847ed5516f5ce29ea36e65c0f0ee5/piramirakuzutavo.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16073584eda306---jasupulira.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=aeschylus+the+oresteia+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0003b0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3B0C5 5336 bytes
SHA-256: 02324789c83f6129bfb2283b33797a4c4311b0be5383771d863306e4544e2722
font_01_sfnt_off0003c2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3C2EF 10740 bytes
SHA-256: cf95c8539e3cb77021d762077d03157e27a9096c04212cc509beda12bcf16d0c

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