Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf9a7a4bd88c73a3…

MALICIOUS

PDF

84.5 KB Created: 2021-09-06 03:20:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 367b68168f932dbc1c063f385286dd67 SHA-1: bda5547971d83f131c962d25c4571833d62ac170 SHA-256: bf9a7a4bd88c73a3bd9d76e2116a71007d5fad9c71eb32c34794fded4bdc769b
204 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as a phishing trojan. It contains a link farm pointing to various PDF files hosted on potentially compromised or disposable domains, suggesting a lure to download further malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/bepadigu.pdf In PDF document text
    • https://decoveinvestment.com/userfiles/file/33189514083.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/difane.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210703_58CD3C525F66087A.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608374823bc7a---nisoditofew.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf64614c5b5---sikisowe.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/67053533233.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/94441105716.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/24402445085.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/94699489424.pdfIn PDF document text
    • https://tomas-music.com/contents/files/pemiwu.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/89274213929.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/80eb1ed6d40fb2cfdba32dbd14dfaa2a/fiwozisiwinakuzirafo.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/4dc36e00b5e889df88c467befc82fb6c/16506358117.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/nixegozeremozidezov.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/33519868717.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/bigaridojapibelexituki.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609472aecf714---94685858736.pdfIn PDF document text
    • http://regmac.net/userfiles/files/13678428991.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ce494d3922a---17057745651.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/69160250861.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/52418697265.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/9v5tj8erk86hus3oddtlhgam92/16856711877.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/10761970780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=projectile+motion+practice+pdfPDF 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_off0000e26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA80 18696 bytes
SHA-256: 965dc7afe9a3b6654147f9d926d039b5ffbb0df7ad85cc821038ecd155e37797
font_02_sfnt_off00012b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7F 10744 bytes
SHA-256: f12b97b070ab993d104c61c1777213430d3bcfb9ce884f3ea9ed51e0bca88d3b