Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd74336ae4aaf0a5…

MALICIOUS

PDF

84.1 KB Created: 2021-09-07 17:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 221ece5324d5cb10a98cc8a28705d5bb SHA-1: 328e15150fb5a8618fb4a95ddee5ef39095b870c SHA-256: cd74336ae4aaf0a5c7946c7ed2f3eead0b23380bcd8fbdc7c5e8f48806b164cf
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting, likely to lure users into downloading further malware or submitting sensitive information. The embedded URLs and the heuristic firings strongly suggest a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://thuanxuongmonmb.com/admin/webroot/upload/image/files/39445299341.pdf In PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/vinojenolomogobavu.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/lekalinizubavimudidudawed.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/temuku.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d174301fda---fadukilus.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/77303312988.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/31431386978.pdfIn PDF document text
    • http://charivne.info/images/file/maraso.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/37662979381.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/jifaju.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160784833c70ee---naroxezelumidowopujo.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c5099f8f1---rureximimagexojis.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/44088735975.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46df09d8d6---zaparonevufewabakizul.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/4d01914e301a4dbc67a437e7b1280b1b/66787251894.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/livababoxalozokujixe.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/25588862648.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c46fd015cfe---durituxen.pdfIn PDF document text
    • http://zippy-inc.com/app/webroot/userfiles/files/mareloxaresujede.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/9719651a62ed33c6fb04381cbec516e1/lakoxuxa.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b1c61e8ec---fogevegelunalibatonalowo.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/rukojamemi.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/3ffe4e3f6592bcfdc4f7340cd3000e9c/gukoxonip.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/63373213948.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=online+file+converter+excel+to+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://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_off0000e6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D7 16864 bytes
SHA-256: 29fc9eb2c7b0b075641c62c3541ae9dd03abd37e412789e2cee44c1f9eb61569
font_01_sfnt_off00011298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11298 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAF 10476 bytes
SHA-256: c7fad53e0be1cc440a042b3af04cea9641d920a7dcb0824a21e42e67e0b4a95e