Malicious PDF — malware analysis report

Static analysis result for SHA-256 556ad2e9928d28f2…

MALICIOUS

PDF

84.3 KB Created: 2021-09-17 14:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cc5c6180da0b58d36cde0b57fe169857 SHA-1: 8b585add208027a9909fe5b1d73e62d8fc443372 SHA-256: 556ad2e9928d28f29b95ec5d5dcd71e7397fc42cade5531bbeee168f75e6a1a8
172 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a 'download button' lure and links to compromised WordPress upload storage and disposable hosting, suggesting an attempt to trick users into downloading further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hiddencliff.kr/FileData/ckfinder/files/20210912_069BDB34D947E945.pdf In PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/13385863308.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/wutilovexib.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/vobirigawuvewedipebaxutip.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/gejoleloxidebivaxofu.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/61221794037.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/55807731536.pdfIn PDF document text
    • https://riwg.in/userfiles/file/kawogiradapinapobip.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109011043139582.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613044ea88a63---39794879033.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/vujusuxejagavevoxadonu.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/fetudibigepinanu.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/38461260863.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109150205086367.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16141660e8d8b0---babujijelijizojowiler.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bf1033910---sajedefab.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/62920030595.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/gebateviwora.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/zaxoperibediwufokepexir.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/86689971470.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/6871061045.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/53865530502.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/xarudolilofisolanamovavot.pdfIn PDF document text
    • https://bem-sa.com/img/file/72695479423.pdfIn PDF document text
    • http://dubossari.es-pmr.com/constructor/dubossari/ckfinder/userfiles/files/72379115101.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=pokemon+diamond+version+zip+file+downloadPDF 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_off0000e239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE239 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA50 10864 bytes
SHA-256: 47487dca035d21ce9709a9096f9782f0d63d82d8de924b86790bc3b03d91437a
font_02_sfnt_off0001137a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137A 18296 bytes
SHA-256: 09a83426e03b40f82e0db7d7ded9cd7a5676afc7506345acb83f14e5316de0e1

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