Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d9210fce0ff475f…

MALICIOUS

PDF

81.2 KB Created: 2021-09-06 16:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0d58885917b5de916a4cd8c44938d981 SHA-1: ff9ed2e8e539cd2ba353a2766e0ee9f292823d5e SHA-256: 4d9210fce0ff475f1ad6896f359f927d3f5be118866d0414e21283aec48ee281
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to numerous websites, several of which are hosted on compromised CMS upload directories, suggesting a phishing or redirection scheme. The presence of multiple external URIs and link farm heuristics supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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.
  • 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 http://agendatourvietnam.com/hinhanh/file/teliwatilejavej.pdf In PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/26375623314.pdfIn PDF document text
    • http://piscesappliances.com/userfiles/file/17162406491.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fd0e3d9c1---51566856247.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6af431fc9d---rareb.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/krp947p29k79irqofle2fikfr5/44165275396.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/62207919768.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/milukulelomaxebi.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5c6f31654---zexaritatezefov.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/21522858596.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080513030b69---luraxonavugozeb.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747a5f853b9---pokaveradebodagetoji.pdfIn PDF document text
    • https://artbynela.com/uploads/file/50852523716.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/72948986868.pdfIn PDF document text
    • https://groupburuemas1.com/contents//files/pinojeligufes.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/resozamulebalufewizanepa.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/wazujobebodogorutebiboren.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021051006224389.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/gobebikime.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/5156f86a93966aab5af2f89afc9da098/gatagopafa.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32473793853.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/50b157690b7aef94a9d6c0b94087f126/31616462801.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/67515512441.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/49mjnvcieehc1s7m43nat0l298/jinevilomoxeg.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/l6m3vkp8jru5njud7g9m5pcl28/wufolodowagonux.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16079b12eb6d74---xiwuzuriwifaxavixaxozubiz.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/59c33c0e1aae7e586d3f67888dd7973b/60222179881.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=causes+of+the+american+civil+war+worksheet+answersPDF 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_off0000d73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73C 17008 bytes
SHA-256: 996c7c66b1e963cdddc6919bd0136c2eaac9e676be624ea6690d5240bf68d7db
font_01_sfnt_off00010342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10342 10976 bytes
SHA-256: f48050162ea7b76ff895f2e3d58c7f4c1afb106ba2ce655a01fefeec5db9d938
font_02_sfnt_off00011ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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