Malicious PDF — malware analysis report

Static analysis result for SHA-256 25e650d066742686…

MALICIOUS

PDF

85.6 KB Created: 2021-07-31 17:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 53fab9e58113ea7d8d902074075f4613 SHA-1: a19c7cca6082aa951ab6e2e25f7d0e8a6d2dc838 SHA-256: 25e650d066742686ae315b7323c41c8e54f20a05fe47ab4785a335cd6d8eceb8
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the links likely serving as the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/l4b6n17dcqrjecg5qed7092jk0/2523988453.pdf In PDF document text
    • http://stoewebdesign.no/userfiles/file/videsalaken.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/kojesaviki.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/kaziro.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/19b5738b22146bdf70d21a1fbfaf632f/voxigakaxaj.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083b2e920df4---fopepijiw.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210618_8EC269C9E8BF2073.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44df76366d.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/11541417836.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/dejutonove.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/dugigatodurifovokin.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/75141827002.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/gidepivesesutadakigejuxop.pdfIn PDF document text
    • http://babamoleskine.com/files/file/pivudezivazuzuro.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/3k43lilmo7s9k360f131gt0gj2/14128666399.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/taom08jiibenv6emvobg1k66gq/jiponija.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/8c42ab2c6b432028eed91f8f8c8cc14d/69891178513.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/9fa558bf0fabfbd2c9dcda2ef3d9d9ea/lirazezuradasar.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895b3a9650a---wanoxaroxawatedebomol.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/d5559f6718d56b8b730670ef504e6311/30644011957.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/pupawokuwaba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+write+self+appraisal+for+teachersPDF 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_off0000ed49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED49 16300 bytes
SHA-256: a18207dd7eb59953759f2cb1c88ad50667af017e7dbc2ae4d4f7815a08355c6e
font_01_sfnt_off0001175f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F76 10552 bytes
SHA-256: af2778594f3003ef68b57b6abaf0a00bf849efa12e24a32b7fd10dce9768ab81

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