Malicious PDF — malware analysis report

Static analysis result for SHA-256 199d88a9f62f0d27…

MALICIOUS

PDF

80.3 KB Created: 2021-09-13 02:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 78cf200158c2ad1b1eeb2780093a03b6 SHA-1: 71a72c948aff5b529a94467398889bfb61bb3b0d SHA-256: 199d88a9f62f0d27b4df48068f012f45dfcbe3b335ae852fa76b6db33ac39067
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports the lure of downloading a malicious file. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=redmi+note+4+new+update+2021
    • http://sspvjd.com/FileData/ckfinder/files/20210906_51DC15FAB47E5AD1.pdf
    • https://equinox-e.com/upload/files/togipelalukowowat.pdf
    • https://horacebatten.com/ckfinder/userfiles/files/zixenovu.pdf
    • https://bomberosdenavarra.com/userfiles_nexo/files/riginajonepixamepakegur.pdf
    • https://alley.52886.tw/uploads/files/madixez.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16132af323d2e1---lejalegugenonib.pdf
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/82264517615.pdf
    • http://www.jindatunnel.com/up_files/file/jekikotesemifota.pdf
    • http://uleshuzatshop.hu/files/file/fumaninexukum.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/e1212a30214f84aaffa7d8e8ff928fa1/bujokaka.pdf
    • http://pi-consulting.ch/download/lumusesalokovojites.pdf
    • https://electroagro.es/pub/files/52251854037.pdf
    • http://www.cerel.eu/images/wyswig_images/file/tipeko.pdf
    • https://woft-dining.com/webroot/editor-uploads/files/vujofimim.pdf
    • http://xedaphcm.com/luutru/files/regopideguvaxipakapusim.pdf
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75898068218.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e77e26cb38---mifezesowuru.pdf
    • http://www.adarshvidhyasankul.org/userfilesfile/pevuxisojerepeximugesojo.pdf
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/29270686593.pdf
    • https://questyme.com/userfiles/file/55974323651.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccad4d0a42---84885942893.pdf
    • http://kingsap.com/file_media/file_image/file/gusutavamoberi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3af.bin
27600546806834d2c1882413a7e22da078135aeab7bcea3789e4090bbe061d05
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AF 10844 bytes
font_01_sfnt_off0000ecd4.bin
309bc65696a8bcf004adaab4a52f89393e7ffff2bf2a7c98145555dc7462ba25
pdf-font-stream PDF embedded font (sfnt) at offset 0xECD4 18200 bytes
font_02_sfnt_off00011bec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEC 16792 bytes