Malicious PDF — malware analysis report

Static analysis result for SHA-256 be065584e5cfeeb3…

MALICIOUS

PDF

94.2 KB Created: 2021-08-17 01:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 710a1a5d8cc1294e1cdf3410d43df582 SHA-1: c5875f2ac8d98f69cca9466c21842479f4a927e5 SHA-256: be065584e5cfeeb3d78953f09f6ec3ab70dc06dc31581297d20b3e5d04b7ea39
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no explicit script was found, the presence of embedded JavaScript streams and the nature of the URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • 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://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160afdf3e011a7---89058421504.pdf In PDF document text
    • http://beccaro.it/userfiles/files/65454525493.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/tibepixebifikoki.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/lofenabudamanurited.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160867d3348e74---89629066168.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/36c81837e738ed9ca7ba0e067d207dcc/81601078033.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/kanadopuzoxud.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/17406509987.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/cca79ca8b68359bf0750c24e9bf2b40b/sajelofo.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/jakubo.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c79ca3d94e2---44286755491.pdfIn PDF document text
    • http://ruihuitax.com/files/file/zimiwexodenoxiputovebar.pdfIn PDF document text
    • http://samtekelektrik.com/files/99909682910.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-8-12/20210812123614438220.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/1a43743b659e45ea87e5097faeb15b84/40410195335.pdfIn PDF document text
    • https://win-win-keiba.site/js/ckfinder/userfiles/files/ruloselugejetazosorofeje.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/wojetazolinetazewatimokiw.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/81420613663.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f06d6f388---48027285647.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/mekugonot.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/78050865761.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=gre+word+list+with+sentences+pdf+free+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_off00010da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA4 16904 bytes
SHA-256: adadb1a7ccba02388b8fa5e220891364438caa8af5fea03cc69a3a6b2d56a413
font_01_sfnt_off00013986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13986 10844 bytes
SHA-256: 08b990cfbdabc23e8df48234766d918efee07a09791300c9cacddce59ed153a8
font_02_sfnt_off00015296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15296 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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