Malicious PDF — malware analysis report

Static analysis result for SHA-256 25d7310e8439383a…

MALICIOUS

PDF

84.0 KB Created: 2021-09-16 03:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4e3f17755a5fc975b793a7c7bae5fcc9 SHA-1: a61773361ad6c3bb4190df08e9db26cdbb957c5b SHA-256: 25d7310e8439383a9aedf6c5ec282017b401197f931c98ae1b9e54ac91ff2ede
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF structure, combined with the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics, strongly suggest this PDF is part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ourcampuswindow.com/ckfinder/userfiles/files/bururexebofewetoli.pdf In PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161400a9f57b27---15208973301.pdfIn PDF document text
    • http://swhos.com/upload/files/vebikaxebomoxitupun.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/12615474457.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/16952647636.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/93025783165.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/likipesus.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/42616995394.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/luvoderejom.pdfIn PDF document text
    • http://candientuvibra.com/images/file/sasuzokowowiwij.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/bixakazafu.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/8df322d9022c9309a524cdfb717b0094/42375754714.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/41910868305.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/74510237292.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/jivusonaf.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613a846ee7994---66383585420.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/23538181332.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109130847245374.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/28490297928.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/ca306fa3172555436034d883370a15d0/kosop.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/7872408249.pdfIn PDF document text
    • https://ebooksweb.net/files/file/67033321180.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/89516039972.pdfIn PDF document text
    • https://esz.jp/img/editor/files/62469290522.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+download+tekken+3+for+androidPDF 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_off0000e356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE356 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6D 10520 bytes
SHA-256: a725b5389ebb59e894b825511ede4ae3d2114aef54d65c33deefb4cefa69a0ee
font_02_sfnt_off00011381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11381 17904 bytes
SHA-256: b859ca869effbdf3bf293d958ed402b8188a52c672566381b2a67586c690ce38

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