Malicious PDF — malware analysis report

Static analysis result for SHA-256 487769c8f03940b4…

MALICIOUS

PDF

82.3 KB Created: 2021-09-21 01:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b6a5e4ac74a32428df7bb601c2e65b55 SHA-1: 286ddb0d4cb38092d50d2971b773c532e5ed7906 SHA-256: 487769c8f03940b44508194ed7401e74ccd9b871df0fcfe9c0cd7cb79b86ab8d
232 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links to external PDF files, some hosted on compromised CMS upload directories. Heuristics indicate a lure to install browser extensions or updates, combined with visual download buttons, suggesting a social engineering attack. The embedded JavaScript likely facilitates the execution of malicious code or redirection to further malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 10

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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
  • 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.
  • 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 http://phoiinnhiet.com/images/uploads/files/26473740376.pdf In PDF document text
    • https://pinkrali.com/calisma2/files/uploads/kuvimobutajotet.pdfIn PDF document text
    • http://canoeing.by/pics/files/fetiduzaxetabegozera.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d59151c592---walupafufeziresobipum.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/9n8ifeld8bh90a5i60pn592rdt/77588980202.pdfIn PDF document text
    • http://ccsl.asia/files/22074051589.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/56925170898.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6a1df0f8e---mewiguvis.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421770614f0---fusib.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161470203c8721---41964890125.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/55076017844.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/61911311765.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/dapejizugoxivetepizenibob.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614036393686b---xulapewaganinili.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/domazikuvitulagajuta.pdfIn PDF document text
    • http://ambartakip.net/belgeler/file/84905593547.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/92015137419.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/97746153653.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/90504741612.pdfIn PDF document text
    • http://cpviettin.com/upload/files/maludupupobepupif.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/daroravoxusumepokem.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/78058967311.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/pawibakuresiwazax.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/nupivatipotaf.pdfIn PDF document text
    • http://risme.vn/files/11870020562.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+pass+info+from+android+to+iphonePDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/23984463258.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_off0000dd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4B 10792 bytes
SHA-256: 4afdd95138d1b3f6da4ee443383d3417b6b77a8bf4051e31b1515293260e9247
font_01_sfnt_off0000f602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF602 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E14 17484 bytes
SHA-256: 6f5b741dc7b410f2d2aa85a2a41267c0729370a730d308eaf7bcb8eb3a9732de

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