Malicious PDF — malware analysis report

Static analysis result for SHA-256 a585954f470ad752…

MALICIOUS

PDF

80.3 KB Created: 2021-06-28 23:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5961c7070143a8ec74fde839efd28e7b SHA-1: 2f733c7535c4a0588a4a6d5510638b65c843d1bd SHA-256: a585954f470ad752860a7180cadc009ef321f238cdd64f396106fd48d4062155
204 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and multiple links to external PDF files hosted on compromised websites, indicating a phishing or malware distribution attempt. The 'Clipboard command execution lure' heuristic suggests the document instructs the user to copy and paste commands, likely to download and execute a second-stage payload. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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 https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/fim0raphc5b2ae437bo6vueqo3/debukamogunetalobu.pdf In PDF document text
    • http://musclecar-taps.com/js/upload/files/75072671806.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/667684475.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/pqjvhr3hpdt9oeupiqvdtomkqh/55589499409.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b52547422a---1045730710.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/e2d9b2b130f028285fd0f23016d5d5f4/wedevavuzek.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///59229146782.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/kuwijuv.pdfIn PDF document text
    • http://alkanboya.com/files/file///vawexamopemolenoro.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b599266e83---kazuxexekifudi.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/p44om11h7gc3642putfe9o8780/renotazupatiwaxozixisa.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/4522831804.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/40506832736.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/zagugobiferil.pdfIn PDF document text
    • http://derma-dts.de/files/file/winijumam.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be8bb76b6fc---96233314326.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/575tfjsl9efqkvif0abbq0iq2j/goruxot.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b96125718---razujujowifakad.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/riboroxum.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/eb650c3b5aa779e1fcdc4c06f78f8e51/11116569975.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/849535b58fef7706305b95d41bb6bf70/39418616748.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/71418482564.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a3de76bff5d8e2d0ec6ded309809a464/11951036618.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609c71196a704---dinuzikotudadaboponumu.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/25249768466.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=reproduction+in+human+beings+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_off0000d40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40F 11308 bytes
SHA-256: c1dbc3907798279814136cea959128055f439bfc4eb3ef14410badad7309fd96
font_01_sfnt_off0000edff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10611 17360 bytes
SHA-256: 248176fade8662273569e3ad33c6f91e9e00c0af4e06596d925fc333f3f5932b