Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b6863ac293d30ab…

MALICIOUS

PDF

87.8 KB Created: 2021-09-20 08:20:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4e121d0a00c8b886d9b2f30c6928881b SHA-1: 8ce7162a9e0c1715947ea17729ce61b8d4a6fa6a SHA-256: 1b6863ac293d30abefbe83fdd157ca236e8a3c432ed0ff75ecd0c07603a3f238
176 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 or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://irlanc.ru/uplcv?utm_term=beyblade+burst+qr+codes+2020 PDF link annotation
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16137e4fb8d0ea---11947795906.pdfIn PDF document text
    • https://rafautama.com/uploads/file/fezifat.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/takezibag.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/91499425177.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/46012738451.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/muvuzir.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/33055419983.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109130507146568.pdfIn PDF document text
    • http://artdental.hu/editor_up/sirogevenexexinoxuro.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/52543383234.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16145879644cf4---vapatetij.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/vafavaxisedazudukav.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/91790135677.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/9770009780.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/46598761885.pdfIn PDF document text
    • http://mlead.net/images/e/file/losazovekibop.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/vifaxekakewabukara.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c27f133622---jixebagifixawuzuk.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/19884500918.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/7306502853.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/munigunapen.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/zivusowamovexerezasu.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109100124574812.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/3d84bc6b4c26f326214219ea71370012/zemumad.pdfIn PDF document text
    • 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_off0000ef9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B2 10964 bytes
SHA-256: 6e34bc4c590fb85255390c8d3cfa07e703ee78033401f4cdf1449836f9cf9db4
font_02_sfnt_off0001212f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212F 18532 bytes
SHA-256: 10f257026384261386b8e5c0de476fd600c195a1ec6301c71c87093be5a62821

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