Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd87e63ff3562f74…

MALICIOUS

PDF

84.7 KB Created: 2021-09-06 08:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a624a64bbdc06ea9f6f699e373f0572c SHA-1: 43193d4b6a941a194ba6d191b8392b4974732bc1 SHA-256: fd87e63ff3562f745c8ed38e382a4ebb5b1eced253ad2e252499d668581d3411
164 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to external sites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to distribute further payloads. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6140a211a---kenodepisunulisiferogukew.pdf In PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760942646c1---36206937154.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/29689092581.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/jugomepeforilon.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607839aedfdbf---80510506955.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7pcgrjhvvv1iaa4e4l203q84t2/gigaxopabesoramak.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b77520d05a---27747617605.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/bf7168f8e0b412bf8ae7ea0d3a72b3b8/piriwifeduboxonetoritatu.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/41606382502.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/vapemipilotemajopibodogi.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/fonekisomikoruvaxigeboje.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/96991389529.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/82072904507.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/pewuzufevudokoreg.pdfIn PDF document text
    • http://anupbolivia.com/images/files/69611050557.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610314bd1c362---xovonige.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16085ab2f44450---luxajenokejakirodod.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/8815605787.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/67322046385.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/7325138818.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/e7ac29527fe3c35e7d5a77426707be6f/26253753610.pdfIn PDF document text
    • https://aashianarealty.com/file/14494696304.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+create+a+editable+pdf+in+indesignPDF 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_off0000e5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDE 11012 bytes
SHA-256: b24015a3af4a5907dfc4f20308592ed9396bf86bd0d986aefde6b103fa1cca6e
font_02_sfnt_off00011722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11722 17816 bytes
SHA-256: a52a018de1cecc5232181e6d54e08c2df231303f09ef558f4fc1386c23727a5e

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