Malicious PDF — malware analysis report

Static analysis result for SHA-256 13774c39c842159d…

MALICIOUS

PDF

69.4 KB Created: 2021-10-02 16:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4750248d8089a3c85aad1bdb29ba569c SHA-1: bc685bdf24d819e156f2df6a6f61d4e01df9f357 SHA-256: 13774c39c842159d82957a01d5c97d36e8384afdf5df6a18c405635ebe9a3a02
164 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to other PDF files hosted on various domains. Heuristics indicate a 'link farm' pattern, with some URLs hosted on compromised CMS uploads. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the prevalence of suspicious links is the primary indicator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://ngusacdon.com/upload/files/24288710349.pdf In PDF document text
    • https://jnnjhansi.com/userfiles/file/19965031982.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/nofejogol.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/73143063012.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161442c9ca47ad---91581268726.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/sisasagaxinigesi.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/tufilupitiserukuvezozu.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/denavulurimagotiba.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/toxatoxefi.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/bujake.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/8a8004702c5eca51849a7f381ca38a82/fatuwotezavorelaveziti.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/fafoposepurer.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/34243267261.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/mojifimenajawemudinul.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/kosukoru.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/donoperagewemux.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/74027166675.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/muzowininuxezomixiko.pdfIn PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/fozolaxonu.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613206e09e896---lepimujefabi.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/nowadefumemeridefape.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-23/20210923021851562942.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=numerical+methods+to+solve+nonlinear+equationsPDF 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_off0000ae79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC690 10924 bytes
SHA-256: 22761347e86876fad0ef95ef783c6cb799ac69dde2c4ad62205f456fe60e3845
font_02_sfnt_off0000df7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7B 15784 bytes
SHA-256: 99344c78cc2d1b9006637febdd1846113479e17655068cc6853849ede96068f1

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